SubNamer is a free software available with Windows, which allows you to rename subtitle files (single or multiple files), which is very useful when working with a large quantity of files. In order to do that, you have to specify the source repertoire, the name format, define the subtitle file extension type (srt, ssa, sub, etc) and video type (AVI, MP4, MPG, WMV etc).
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Belle Nuit Subtitler
Belle Nuit Subtitler One of the rare available free subtitle editors available on Mac OSX, Belle Nuit Subtitler allows you to create and edit create and edit subtitles from many different video sources. It is compatible with most video editing software and has a spell/grammar check function.
Any DVD converter
Any DVD Converter Pro is an RIP DVD software and also converts videos into different formats (from DVR-MS, WMV, AVCHD, TS, TP, RM, RMVB, MOV, MKV into AVI, WMV, MP4, 3GP, FLV and audio formats). Read more
Any video converter

Any video converter is a PC RIP software and video convertor which allows you to convert videos into several formats such as MOV, M2TS, OGM, RMVB, RM, WMV, QT, FLV, MOD, TS, TP, DVR-MS, Divx, etc. into AVI, WMV, MP4, MPEG-1, MPEG-2, FLV, SWF, MKV, 3GP and 3G2.
Avidemux

Avidemux is a video editor, which works on PC, Linux and Mac. It allows you to crop, recode and apply filters to videos. It is considered the equivalent to VirtualDub, (only available with Windows).
D-vision
D-Vision is an OpenSource software, which works with Mac OS X. It, allows you to make DVD copies by compressing them in Divx 3, Divx 4, Xvid or h264 formats and exporting the sound of a DVD into mp3 or ac3 format.
FfmpegX

ffmpegX is a coding tool which works under Mac OS X which allows you to read and encode MPEG-1, MPEG-2, DIVX, XviD, VOB and VIDEO_TS, Quicktime .mov, DV, WAV, Real Audio, Real Video, H263, MP4 H264, PGM, YUV, PPM, AC3, PCM8/16 bits, mulaw/Alaw, WMA-1/2, SUN AU, MP2, MP3, AAC, 3GP, FPS1, ALAC formats amongst others.
Handbrake

Handbrake is a transcoder which works with Linux, PC and Mac. It allows video coding in the majority of formats. It is a powerful and efficient tool due to its many advanced coding options (sound and video settings), and its image adjustment option.
Kigo video converter

Kigo video converter is a video conversion software, which works with MAC OS X. It accepts most standard file formats and allows a simple method of inserting subtitles.