As far as I know there are two free video converters that are not just free for download, but also accessing full functionalities.
1. SUPER © Simplified Universal Player Encoder & Renderer.
A GUI to FFmpeg, MEncoder, Avi Converter
MusePack, Monkey's audio, Shorten audio, TAK audio, True audio,
WavPack, the libavcodec library & the theora/vorbis RealProducer's plugIn.
If you need a simple, yet very efficient tool to convert (encode) or play any Multimedia file,
without reading manuals or spending long hours training, then SUPER © is all you need.
It is a Multimedia Encoder and a Multimedia Player, easy-to-use with 1 simple click.
2. Format Factory is a multifunctional media converter.
Provides functions below:
All to MP4/3GP/MPG/AVI/WMV/FLV/SWF.
All to MP3/WMA/AMR/OGG/AAC/WAV.
All to JPG/BMP/PNG/TIF/ICO/GIF/TGA.Best avi converter
, Rip Music CD to audio file.
MP4 files support iPod/iPhone/PSP/BlackBerry format.
Supports RMVB,Watermark, AV Mux.
Format Factory's Feature:
1 support converting all popular video,audio,picture formats to others.
2 Repair damaged video and audio file.
3 Reducing Multimedia file size.
4 Support iphone,ipod multimedia file formats.
5 Picture converting supports Zoom,Rotate/Flip,tags.
6 DVD Ripper.
7 Convert avi video
OS requirements: All Windows OS