Audio Tools
eac3to - multi purpose tool for audio on (HD)DVDs, Blu-ray discs and Transport streams.
BeSweet 1.5b31 - Advanced audio transcoding tool.
HeadAC3he 0.23a - smart & fast AC3 -> WAV/MP3/OGG/AC3-WAV transcoding utility
Lame 3.95.1 - best free MP3 encoder

AVI Editing tools
AviDefreezer - fixes frozen frames
AviDemux - codec framework independent cross platform editing and encoding tool (also supports MKV and MP4)
Avifrate1.10 - framerate changer for Avis
DivX Fix 1.1 - to fix broken DivX downloads and crashed ripping sessions. NOT for frozen frames!
Ogg Cutter - utility to cut Ogg Media streams
OggMux - ogg media stream multiplexing utility
VirtualDub 1.9.11 - latest official release. Website.


Calculators
Bearson's Bitrate Calculator

Codecs
DivX 3.11 alpha - the original codec that started it all
DivX+ Codecs - lastest DivX codec by DivXNetworks. The successor of DivX4. Website
XviD Latest Codec - imho the best MPEG-4 ASP codec out there. Website

Descrambling / Ripping tools
AnyDVD (HD) - on-the-fly decryption layer for DVDs and HD DVDs / Blu-ray discs
Blu-ray Disc Ripper 1.5 - Blu-ray descrambling tool
DumpHD 0.61 - Blu-ray / HD DVD decrambling tool.
DVD Decrypter 3.5.4.0 - the most versatile ripper out there
DVDFab HD Decrypter - simple ripper that's always updated to handle copy protection by disc corruption mechanisms

Decoders
DGAVCDecNV - AVC Decoder and Frameserver for nVidia GFX cards. Website
DGAVCDec 1.0.9 - just like DGMPGDec, but for AVC content. Website
DGMPGDec 1.5.3 - latest version of the tool formerly known as DVD2AVI. Website
DVDx 2.2 - all in one DVD -> VCD/SVCD encoder. Website

Digital TV
Cuttermaran 1.69a - frame accurate MPEG2 cutting tool. Website
MPEG2Schnitt 0.90 - tool to cut out commercials from MPEG2 streams. Website
ProjectX 0.90 - demuxing tool for DVB streams. Website
PVAStrumento 2.1 - PVA demuxing tool. Website

DivX / MPEG-4 Encoders
Nandub 1.0RC2 - SBC encoding utility

Filters
ffdshow - general purpose audio and video decoder filter. Website

High Def Tools
BDInfo 0.5.1 - shows properties of all your Blu-ray discs. Website
BD-Rebuilder 0.20.07 - like DVD Rebuilder, but for Blu-ray discs. Website
BDSup2Sub - converts subtitles from Blu-ray / HD DVD format to VobSub (DVD) format. Website
Blu-ray Region Code Remover 2.5 - removes region coding from Blu-ray rips. Website
EvoDemux 0.627 - HD DVD filte de/remuxer.
MakeMKV 1.6.15 - converts (HD) DVD and Blu-ray discs to Matroska (MKV) files. Website
smartLabs tsMuxer 1.10.1b - supporting ES/(M2)TS/(E)VOB/MPG/MKV input and (M2)TS/Blu-ray output. Website
TsRemux 0.21.2 - transport stream de/remuxer. Website

Launchers
MicroDVD Autorun 1.93 - DivX autolauncher for Micro DVD Player
Mini DivX Launcher - fully automated codec installation and movie launch
MovieLauncher Plus 1.11 - the big brother of movie.exe so to speak.

Media Players
smplayer - multiplatform frontent for mplayer. Website
VideoLan - standalone video player which can handle almost anything without requiring DirectShow filters - Website
Zoom Player 8.5.1 - a Windows Media Player replacement, optimized for TV output. Website

MPEG1/2 Encoders
HC 0.23 - high quality .AVS to MPEG-1/2 encoder. Website
QuEnc 0.72 - high quality .AVS to MPEG1/2 encoder based on ffmpeg

Subtitles
Subadjust 1.56 - adjust, convert and split subtitle files
SubRip 1.30 beta 10 - a subtitle ripper. Website
VirtualDub subtitle plugin - used to add ssa subs to an AVI
VobSub 2.23 - a subtitle plugin for VirtualDub & Avisynthand DS filter for subtitle overlay during playback.
VobSubStrip 0.11 - strips unwated subtitle streams from VobSub files. Website

Support Utils
AviSynth 2.57 - a powerful video editing tool based on scripting
AviResetAll - resets all AVI settings for Windows (use if above doesn't help)
BatchCCEWS - automates .avs encoding using CCE. To be used together with DIF4U. Website
ForceAspi 1.8 - if you get ASPI errors install this
IsoPuzzle 1.7 - recover damaged DVDs. Website
Robot4Rip 0.6 - automates preprocessing of DVD sources for Gordian Knot & other tools
VFAPI - includes a VFAPI Reader Codec and VFAPI Converter

VOB Tools

DVD Shrink 3.2 - a one click DVD transcoding tool. Website
DVD Rebuilder 0.98 - a one click DVD transcoding tool using CCE/Rejig/QuEnc for video encoding. Full installer.
FixVTS 1.603 - adjust DVD files for better compliance with various one click software
IfoEdit 0.97 - edit IFO files, create IFO files, stream processing for DVDs, DVD image and burning capabilities included.
ImgBurn 2.4.4.0 - Continues DVD Decrypter's burning engine. Website
MenuShrink 2.41 - Shrinks a DVD's menus.
PgcDemux 1205 - demuxes a PGC/VID/Cell to its elementary streams. Website
PgcEdit - a one stop shop of DVD editing. Website
ReAuthorist 1.0.0 - used for putting DoItFast4U & DoCCE4U outputs together into a fully working Scenarist project ready for compilation