A project like WUDSN IDE is not possible and not worth anything without the contributions provided by others. So here's the list of credits of all involved people and related projects.

Compiler | Contributor
--- | ---
ACME | Krzysztof Dabrowski (BruSH/ElysiuM)
ATASM | M. Schmelzenbach (schmelze)
DASM | Peter H. Froehlich (pfh)
KickAss | Mads Nielsen (Slammer)
MADS | Tomasz Biela (tebe)
XASM | Piotr Fusik (fox)
Linux compiling | Carsten Strohmann (cas)
Mac OS X compiling | Spookt
Graphic library or tool | Contributor
FAIL | Piotr Fusik (fox)
Grafx2 | Adrien Destugues (PulkoMandy), Yves Rizoud (yrizoud)
Sound library | Contributor
ASAP | Piotr Fusik (fox)
JSIDPLAY2 | Ken Händel (kenchis)
File system library | Contributor
AppleCommander | Robert Greene (robgreene)
Emulator | Contributor
AppleWin (Apple II) | Nick Westgate (sicklittlemonkey)
Altirra (Atari 8-bit) | Avery Lee (phaeron)
Atari800Win (Atari 8-bit) | Marcin Lewandowski (jaskier)
CCS64 (C64) | Håkan Sundell (phs)
JACE (Apple II) | Brendan Robert (BLuRry)
Stella (Atari VCS) | Stephen Anthony, Bradford Mott, Eckhard Stolberg, Brian Watson
Virtu (Apple II) | Sean Fausett (fool)
Eclipse plugin or library | Contributor
Eclipse | Eclipse Foundation
x86 ASM Plugin | Andy Reek, Daniel Mitte
Rhino JavaScript engine | Mozilla Foundation
Eclipse Hex Editor Plugin (used as inspiration) | Marcel Palko (randallco)
Java Hex Editor & Plugin | Pordi Estaqual (pestatije)
Java Expression Language Parser | Aaron Gadberry (aaron)