Here's a some kind of compilation of this thread. There are errors/paradoxalities
in this list since people couldn't agree on some aliases/projects :)
Anyway, while I was making this compilation, I noticed that there is an
OVERWHELMING amount of DJs, projects, aliases etc. and there are
several websites which already list these so I didn't bother to verify
any of the info.

A couple of cool sites with discographies:
http://www.franken.de/users/tursa
http://www.thedjlist.com/index.php3
http://www.djzine.co.uk
http://dancemusic.miningco.com/musicperform/dancemusic/mlibrary.htm

[Tijs Verwest]
A3 (w. his younger brother, DJ Montana)
Alibi (w. Armin Van Buuren)
Allure (w. Cor Fijneman)
Clear View (w. Storm)
Control Freaks (w. M.B De Goeij and P.W. Bervoets)
DJ Tiësto
Drumfire
Gouryella (w. Ferry Corsten)
Hammock Brothers (w. C. Fijneman)
Kamaya Painters (w. M.B. De Goeij)
Major League (w. Armin Van Buuren)
Return Of The Native 
Roze
Straydog
The Blackmaster 
Vimana (w. Ferry Corsten)
Wild Bunch
* Magikal Remakes are Tiesto's remixes

[Armin Van Buuren]
Alibi (w. DJ Tiësto) 
Amsterdance 
Armania 
Armin
AVB
Darkstar
Electrix (w. Floris Klinkert) 
GAIA
Gig 
Gimmick 
Rising Star
Major League (w. DJ Tiësto) 
Hyperdrive Inc. 
Perpetuous Dreamer 
Problem Boy 
Red & White (w. Gert den Heijer) 
Technology (w. Gert Den Heijer) 
The Shoeshine Factory 
Wodka Wasters (w. Olav Basoski) 

[Piet W. Bervoets]
A.I.D.A (w. M.B. De Goeij)
Team Deep (w. M. van der Heiden)
R.O.O.S. 
Jonah (w. M.B. De Goeij, Mischa van der Heiden)
Carlos (w. Carlo Resoort)
Control Freaks (w. M.B De Goeij and DJ Tiesto)
Rank / Rank 1 (w. M.B. De Goeij)
Pedro & Benno (w. M.B. De Goeij)
Bervoets & De Goeij (w. M.B. De Goeij)

[Ferry Corsten]
Albion
Discodroids
Gouryella (w. DJ Tiësto) 
Kinky Toys
Moonman
Pulp Victim
Sidewinder
Soundcheck (w. A. vd Bosch) 
Starparty (w. Robert Smith)
System F
Tellurians
Veracocha (w. Vincent De Moor) 
Vimana (w. DJ Tiësto) 

[Benno De Goeij]
A.I.D.A (w. P.W. Bervoets)
Bervoets & De Goeij (w. P.W. Bervoets) 
Ceres
Dutch Force
El Dorado (w. DJ Jim) 
Hidden Sound System
Jonah (w. Piet W. Bervoets, Mischa van der Heiden)
Pedro & Benno (w. P.W. Bervoets) 
Rank / Rank 1 (w. Piet W. Bervoets)
Kamaya Painters (w. DJ Tiësto) 
SAN
The Quest

[Thomas Wedel]
Tom Wax
Wax Trax
Arpeggiators (w. Thorsten Adler) 
"AWeX" (Adler-Wax-eXperiments) (w. Thorsten Adler) 
Bash Brothers (w. Norman Feller) 
BazzClean (w. Thorsten Adler) 
Brain-e (w. Thorsten Adler) 
Bypass-X (w. Thorsten Adler) 
DJ Tom & Norman (w. Norman Feller) 
Dynamic Maniax (w. Frank Cochois) 
Electric Nature (w. Jan Friedrich) 
Entropy (w. Alexander Metzger) 
Fanatic Cracks (w. Urs Krämer) 
German Division (w. Thorsten Adler) 
Hansi HiHat vs. Carl Clap (w. Tobias Menguser) 
Mayhem Bros. (w. Kai Praag) 
Microbots (w. Thorsten Adler) 
Phuture Wax (w. Thorsten Adler) 
Psycho Drums (w. Thorsten Adler) 
The Pulp (w. Thorsten Adler) 
Toja (w. Jan Friedrich) 
Tom Wax & Jan Jacarta (w. Jan Friedrich) 
Toonoo (w. Norman Feller) 
Tours (w. Urs Krämer) 
Wax Scientists (w. Norman Feller) 

[Torsten Stenzel]
Diver & Ace (w. Taucher)
DJ Sakin & Friends (w. Janet Taylor, DJ Sakin)
DJ Mind-X (w. André Forrer)

[Sakin Bozkart]
DJ Sakin
York (?)

[Orhan Terzi]
DJ Quicksilver

[Aaron Liberator & Guy McAffer]
Crash 'n Burn

[Chris, Julian, Aaron Liberator & Paul Harding]
Hardcore Disco

[Secret Hero]
D.A.V.E. the Drummer
Rozzer's Dog (w. Kris Needs)
Dynamo City (w. Chris Liberator)

[Chris Liberator]
Cosmic Trigger (w. DDR & Paul Harding)
Carabine (w. Guy McAffer)
Dynamo City (w. D.A.V.E. the Drummer)

[Gary D.]
Airtribe (w. Arne L II)
Atomic Junkies (w. DJ Gollum)
Bassxpansion
Forkman (w. DJ Yanny)
Kamasutra (w. Revil O. & Martink)
Screwdriver (w. Dr. Z)
Uranus (w. Claus Pieper)

[Kai Tracid]
DJ Warmduscher (I think he's not DJ Warmduscher just the producer of him)
Arrow
K
Computer Controlled
Tyrone TB
ASYS
Arrakis (w. Thomas P. Heckmann)
Kai Mac Donald(?)
Der Verfall
Formic Acid
Mac Acid
Phase 2 Face (w. Andy Jay Powell)

[Mauro Picotto]
Bismark (w. M. Bisegna, A. Remondini, R. Ferri)
CRW (w. A. Remondini)
DJ Arabesque (w. M. Piperno & R. Ferri) ... isn't this Mario Piu?
R.A.F. (w. A. Remondini)
Ricky Effe (w. R. Ferri)
Ricky Le Roy (w. R. Cenderello, R. Ferri, A. Remondini)
Lava (w. Tillman Uhrmacher) 
Megamind (w. R. Ferri)
Sosa (w. Bortolotti and A. Remondini) 

[Hal Stucker]
David Forbes
Tecra
Propulsion

[Pablo Gargano]
Paul Gaarn

[Sourmash]
Razor's Edge

[DJ Johan Gielen]
a Perfect Stranger
Abnea
Alice Deejay (w. Pronti & Kalmani, Danski & Delmundo & others) 
Airscape
Balaeric Bill
Boccaccio Life 
Body Heat 
Des Mitchell (w. Sven Maes)
Strawberry Flavour 
Summermadness
Svenson & Gielen (w. Sven Maes)

[Sven Maes]
Svenson & Gielen (w. Johan Gielen)
DJ Jon & Svenson (w. Johan Gielen)

[Matt Darey]
Lost Tribe
Mash Up
Sunburst

[Seb Fontaine]
Cequenza (w. J.Vern)(?)

[Michael Baur]
DJ Crack
Phobia
Brain xx (xx is a number because Michael is a producer of this quite hard acid serie)
Code xx (like the Brain serie but this one is a hardtrance serie)
Cyborg
Sonic Tool

[John Graham]
Quivver
Stoneproof 
Tilt (w. M. Parks & M. Wilson)

[Mike Parks]
Tilt (w. J. Graham & M. Wilson)
Killahertz 

[Michael Wilson]
Tilt (w. J. Graham & M. Parks)

[Art of Trance]
Simon Berry
Union Jack (w. Terra Ferma)

[Terra Ferma]
Claudio Giussani

[Tommaso De Donatis]
Quicksilver & Orban Terzi

[Frank Zenker]
DJ Scot Project
De Zenk
Arome and Disc-o-thek
M. Roth
Y.O.M.C.

[DJ Errik]
A.C. Schneider/R. Zenker/R. Kusza/U. Papenroth

[Planet Vision]
Pascal F.E.O.S.
Sonic Infusion
Resistance D. (w. Maik Maurice Diehl)

[L. Veronnez]
Fire & Ice (w. J. Leyers)
Airwave
Planisphere
V One

[Ben Keen]
BK

[Tidy Girls]
Lisa Lashes, Anne Savage & Lisa Pin-up

[James Holden]
Mad Dogs (w. Timo Maas & <Unknown>)

[Michael Parsberg]
Safri Duo
Little Jam

[Ralph Barendse]
Alpha Breed

[Dawnseekers]
Threesome (w. Cor Fijneman)

[Jack Molenschot]
JM
Freejack

[Ronald van Gelderen]
Masai
Kid Vicious
Formologic

[Carlo Resoort]
Madelyne
4 Strings
Carlos (w. Piet W. Bervoets)

[Rob Fabrie]
Gizeh

[Steve Hellstrip]
En Motion
Rapid Eye (w. Tim Stark)
The Thrillseekers

[Andy Perring]
Olmec Heads (w. West Coggle)
Pulser

[R. Simmonds & S. Jones]
Chakra
Force Majeure
The Space Brothers
Ascension
Lustral
Ascension & Essence 

[Oliver Lieb]
L.S.G. 
Spicelab 
Ambush 
Superspy 
S.O.L. 
Mindspace 
Smoked 
Genetix 
Metrixx 
Monkey I 
Multiplicity 
Gobiman 
Phools Inc 
Ivan 
Ecano 
Antimon 
Archon 
Radical Impression 
Snakemen 
Strike 
Mars & Mysterë (produced by O.Lieb) 
Psilocybin (Oliver Lieb & W.J Henze) 
Chateau Ciel (Oliver Lieb & W.J Henze) 
DP-SOL (Dennis P. Sarratou & Oliver Lieb) 
Paragliders (Oliver Lieb & - on some - Torsten Stenzel) 
Java (Oliver Lieb & Dr. Atmo) 
Mirage (Oliver Lieb & Ralph P. Ruppert) 
Azid Force (Oliver Lieb & Pascal F.E.O.S.) 
Infinite Aura (Oliver Lieb & Pascal F.E.O.S.) 
Arte Bionico (Oliver Lieb & Marcos Lopez) 
Force Legato (Oliver Lieb & Torsten Fenslau) 
Force Staccato (Oliver Lieb & Marcus Ghoreischian) 
True Minds (Oliver Lieb & Marcus Ghoreischian) 
Freddy Spins (Oliver Lieb & Marcus Ghoreischian) 
E.S.P. (Oliver Lieb & Marcus Ghoreischian) 
Deep Vision (Alexander Hawking, Oliver Lieb, Sven "the Bass") 
Sentinel (O.Lieb & R.Flex) 

[Chris Cowie]
xcabs

[R. Green & M. Duram]
Shango

[Dave Ralph]
Airtight
Tea Freaks (w. James Robson & Sean o'Neil)

[Jesse Skeens]
Medway

[Ramon Zenker]
Hardfloor (w. Oliver Bondzio)
Mega'lo Mania (w. Nils Ruzicka)
Interactive (w. Jens Lissat)
Fragma (?)
Exit EEE (w. Jürgen Driessen)


[Jens]
Jens Mählstedt, Gerret Frerichs

[Cherrymoon-trax]
Axel Stephenson, Yves Deruyter, Frank Kloeck

[Slobodan Petrovic jun.]
Aqualoop
Don Esteban
DJ Jo (w. Joachim Theis)
Pulsedriver

[Mandala]
Commander Tom, Ray Boye

[Bernd Augustinski]
Nostrum
The Ape

[Marmion]
Mijk van Dijk, Marcos Lopez

[Cosmic Baby]
Energy 52 (w. Kid Paul)

[Velocity]
Kid Paul

[Jam el Mar & Mark Spoon]
Jam & Spoon
Storm
Trancy Spacer & Spacey Trancer
Tokyo Ghetto Pussy

[Thomas P. Heckmann]
TPH
Silent Breed
Drax
Drax Ltd. II
Drax Ltd. III
Welt In Scherben

[Elad Avnon]
Dj Spoiled
 
Electric Boutique = Ferry Corsten (not 100% sure)

[Da Hool]
DJ Hooligan
Central Love
Paranoia X (w. Frank Tomiczek & Ingo Kays)

[CJ Dolan]
Quench

[Michael Gerlach, Florian Preis]
Sunbeam
Art Bizarre
Iron Wobble

[Richard M. Hall]
Moby

[Jones & Stephenson]
Axel Stephenson & Frank Sels


[Stefan Müller]
Microwave Prince

[Kay Lippert]
Hardy Hard
Hardsequencer

[Alien Factory] 
Stefan Müller, Bob Henning (early formation) Stefan Müller, Michael Anhalt (later)

[Nico d'Acido]
Robotnico

[Meteor Seven]
Jens Ebert & Manuel Kesseler

[Liason-D]
Sven van Hees, Marcus Saion & Paul Ward

[Microbots]
Tom Wax, Thorsten Adler & Thomas Keil

[Norman Feller]
Watchman
Norman
Terry Lee Brown Jr.
 
[Marc Et Claude]
Marc Romboy, Klaus Derichs & Jürgen Driessen

[Acidphase]
A.C. Boutsen & Ralf Hildenbeutel

[Future Funk]
Jerome Isma-ae & Marcel Krieg

[Roel Butzen]
Microworld 

[Illuminatus]
 Dennis Pierre Sarratou, Armin Jeff Hohnert

[Cor Sangers]
Equator

[Acrid Abeyance]
Carsten Bleekmann, Jürgen Driessen

[Christian Scharnweber]
DJ Mellow-D
Mellow Trax
Novaya

[Aaron Kassar]
Gate

[DJ Manga]
Marc Wehlke & Adrian Misiewicz

[Plastic Angel]
Elef Tsiroudis & Gregory Engelhardt

[Stefan Walter]
Waterloop

[Ralf Fritsch & Detlef Hastik]
Komakino
Fridge
Final Fantasy 

[Michael Kores]
Cores

[Marusha Gleiss]
Marusha

[Nico Gollasch]
DJ I.C.O.N.

[Marino Stephano]
C.M. = Hand's Burn (w. Crisci Mauro)

[Stella Browne]
187 Lockdown
Gant
Nush
Nu-Birth

[Arrola] 
Ruff Drivers 

[Mark Archer & Chris Peat] 
Altern8 

[Simon Berry] 
Art Of Trance (w. Caludio Giussani) 
Poltergeist 
Union Jack (w. Caludio Giussani) 

[Joey Beltram]
JB3 

[Nick Bracegirdle]
Chicane
Disco Citizens (w. Ray "Madman" Hedges) 
Tomski 

[Brian Transeau]
BT
Libra
Libra presents Taylor 
Two Phat Cunts (w. Sasha) 

[Jon Campbell]
The Time Frequency (TTF) 

[Norman Cook] 
Beats International 
Fatboy Slim 
Freak Power 
Part Of Housemartins 
Part Of Mighty Dub Katz 
Pizzaman 

[Matt Darey] 
Li Kwan 
Lost Tribe 
Tekara 

[Dirk 'MIKE' Dierickx] 
Blackmaster 
Extreme Trax (w. Yves de Ruyter) 
Plastic Boy 
Push 
Return Of The Native 
Fun-Tastic
Overtone

[John Digweed] 
Bedrock (w. Nick Muir) 

[Vengaboys]
Dennis van der Driesschen & Wessel van Diepen 
Alice Deejay (w. others) 
Danski & Delmundo 
Nakatomi 

[Paul van Dyk] 
Humate (w. Freichs Schmidt & Huntermann) 
Visions Of Shiva (w. Cosmic Baby)

[Norman Feller] 
Bash Brothers (w. Tom Wax) 
DJ Tom & Norman (w. Tom Wax) 
Toonoo (w. Tom Wax) 
Watchman 
Wax Scientists (w. Tom Wax) 

[Flamman & Abraxas] 
Fierce Ruling Diva 
Party Animals 

[Seb Fontaine] 
Cequenza (w/Vern (Fontaine?)) 
Handsburn 
Mothers Pride 

[David Forbes] 
Hal Stucker 
Prototype 

[Jan Friedrich] 
Electric Nature (w. Tom Wax) 
Toja (w. Tom Wax) 
Tom Wax & Jan Jacarta (w. Tom Wax) 
Wave Captain 

[Pablo Gargano] 
Paul Gaarn 
Halogen 


[Caludio Giussani]
Art Of Trance (w. Simon Berry) 
Granny (w. Paul Brogden) 
Union Jack (w. Simon Berry) 
Urban Shakedown (w. Micky Finn & Gavin King) 


[Mike Gray & Jon Pearm]
Full Intention 
Greed 
Hustler's Convention 
Ronaldo's Revenge 
The Rule 
Sex O Sonique 

[Guido Gronwald] 
Acidphase (w. Cyrus) 
Adobo (w. Cyrus) 
Basic Avalon (w. Cyrus) 
C`N J (w. Cyrus) 
Ensistima (w. Cyrus) 
Highlanders (w. Cyrus) 
Skylab (w. Cyrus) 
Trancesistor (w. Cyrus) 
The Joker 

[Ronald Hagen & Pascal] 
Minaard Acetate 
D-Factor 
Ron Hagen & Pascal M 
Signum 

[Richie Hawtin] 
Plastikman 
Cybersonik 
Fuse 

[Hardy Heller] 
HH 

[Les Hemstock] 
Sagiterre 

[Oliver Huntemann] 
Kay Cee 

[Dumonde]
DJ Jam X & Joe de Leon
J.D.T. (w. Talla 2XLC) 

[J. Mutscholl]
DJ JamX

[Judge Jules] 
Angelic 
Clergy (w. Paul Masterson) 
Hi-Gate (w. Paul Masterson) 
Julius O'Riordan

[Klubbheads]
Greatski 
Izzy Bizzy Boozy Woozy 
Nexus 21 
DJ Disco (w. Ittybitty Boozywoozy, Greatski and (occasionaly) Hernandez)
The Ultimate Seduction

[Andreas Krüger] 
2002 
Der Dritte Raum 
Der Stern von Afrika 
Dr. DNA 
Perpetuum Mobile 
Plaste und Elaste 
Solid State 

[Ingo Kunzi] 
Ayla 
DJ Tandu 
Kosmonova

[Matt Laws] 
Binary Finary 

[Dave Lee] 
Joey Negro 
Prospect Park 
Doug Willis 
Z-Factor 

[Maximilian Lenz] 
Heavy Mental 
Members Of Mayday 
Westbam 

[Timo Maas] 
Little Diamond 

[Paul Masterson] 
Amen 
Candy Girls (w. Rachel Auburn) 
Celine Diablo 
Hi-Gate (w. Judge Jules)
Portimento Passout 
Sleaze Sisters 
Yomanda (w. Judge Jules)
Wand 

[Tobias Menguser]
John Chevalier 
Hansi HiHat vs. Carl Clap (w. Tom Wax) 
Liquid Child (w. Jürgen Herbarth & Rebekka Zafarbakhshian) 

[Jeff Mills]
The Wizard 

Dr Motte 
Euphorythm 

[Nalin & Kane]
Andy Nalin & Mike Kane 
Nalin I.N.C.

Taglialatela Nino 
Placid Angel 

[Hans Jörg]
Nonn DeeRex 
Fugeo 
Luxor 
NonEric 
Ovation 

[Paul Oakenfold]
Planet Perfecto 
Perfecto Allstars (w. Steve Osborne) 
Grace (w. Steve Osborne) 
Virus (w. Steve Osborne) 

[Anthony Pappa]
Freefall 

[Mario Piu]
DJ Arabesque 
Mas 

[Harry 'Choo Choo' Romero] 
Choo Choo Project 
Dronez (w/Erick Morillo & Robbie Rivera) 
Soulsearcher 

[Yves de Ruyter] 
Extreme Trax (w. Dirk 'MIKE' Dierickx) 

[Henrietta Schermall]
Miss Yetti 

[Erich Schmeier] 
DJ Errick 

[Roel Schutrups] 
DJ Isaac 

[Luke Slater]
Deputy Dawg 
Planetary Assault System 

[Robert Smit]
The Digital Blonde 

[Tom Stevens]
DJ Tom Stevens 
Djane Diva 
Pathfinder 

[Tall Paul]
Camisra 

[Andre Tannenberger]
ATB 
SQ1 (w. DJ Spacekid) 
Sequential One

[Jon Truelove]
Hyperlogic 
Lectrolux 
The Source 

[DJ Tim]
Starfighter 

[Elef Tsiroudis]
Plastic Angel 

[Marco Verkuylen & Benjamin Kuyten]
Anglia 
Southside Spinners 
Marco V. & Benjamin 
Jefferseif 

[Nick Warren] 
Way Out West (w. Jodie Wisternoff)

[Dave & Brendan Webster]
Transa 
Cascade 
Transcend

[Michael Wells]
Force Mass Motion 
G.T.O 
Technohead 

[Pancake]
O. Basoski & Erick E.

[Ville Virtanen & Jaakko Salovaara]
Darude

[Vincent De Moor]
Fix To Fax
Sidewalk
VDM

[N. Muir]
Cabal
Bedrock (with J. Digweed)

[Yahel]
Yahel Sherman

[Vincent Kriek]
DJ Vincenzo
MoonTribe
 
[Udi Hakim]
DJ PezJunky 

[Alexander Coe]
Sasha

[Jean-Paul De Coster]
2 Unlimited (w. Phil Wilde)
Bizz Nizz (w. Peter Neefs)

[Phil Thompson]
Moonface

[Science Dept.]
DJ Danny Howells & Dick Trevor

[Jimmy Van M]
Eros Euphony
Freelance Icebreakers

[Atilla]
Coocoma

[3 Drive On A Vinyl]
DJ Enrice & DJ Ton TB

[Curtis Allen Jones]
Green Velvet

[Scooter]
The Shrink

[Delta]
X-Dream

[A.C. Boutsen]
Cygnus X

[Sean Dexter]
Hypetraxx

[Plastic Angel]
Raul de Chile
Tubular Knights

[Axel Konrad]
DJ Valium

[Andy Jay Powell]
Sonic Society

[Martin Y.O.M.C. Roth]
Y.O.M.C.
Xenajo

[Mandala]
Commander Tom & Ray Boyé

[Solar Stone]
Rich Mowatt & Andy Bury

[Ralph Armand Beck]
DJ Taucher

[Paul Draper]
Mansun

[DJ Dean]
Das Licht

[Chris Agnelli & Robbie Nelson]
Agnelli & Nelson
Afterburn

[De Leon]
D. Deleon