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Sega Genesis | Controllers
Make Great Games Better
Doom Builder | www.doombuilder.com
Create and edit levels for DOOM, Heretic and Hexen!
Doomsday HQ | www.doomsdayhq.com
Play timeless classics such as DOOM, Heretic and Hexen the way that they were meant to be played!
Tenebrae | tenebrae.sourceforge.net
Give the original Quake effects and lighting that rival those of DOOM 3!
Extract & Convert Dreamcast Graphics & Sounds
Adx2Wav | www.megagames.com
Convert extracted ADX files to WAV's.
Jaeder Naub | www.jaedernaub.com
Extract various file formats from disc images or individual game files.
Pvr2Png | www.megagames.com
Convert extracted PVR files to PNG's.
Duplicate Cleaner | www.digitalvolcano.co.uk
This isn't an extraction or conversion utility by any means, but it's very helpful for removing duplicate files. And trust me: You'll come across a lot of duplicates when extracting graphics and audio from Dreamcast games.
Note: I used to have a tool that allowed me to extract MIDI's from BGM files, but I've long since misplaced it. If I find it, then I'll post it here.