- ffmpeg2theora a commandline encoder from any format read by ffmpeg to Ogg Theora/Vorbis: svn, latest releases.
- VLC Media Player Can transcode from any source it supports into Ogg/Theora. WARNING: Apparently creates broken Ogg streams.
- GStreamer GStreamer is a library that allows the construction of graphs of media-handling components, ranging from simple Ogg/Vorbis playback to complex audio (mixing) and video (non-linear editing) processing.
- Visonair.tv Ogg Streamer A windows application to stream directly from a webcam to an Icecast server.
- Visonair.tv Virtual Stage Includes an application to encode to Ogg Theora, forces fixed size and encoding parameters though. Registration required.
- GFrontend ffmpeg2theora GUI Frontend for ffmpeg2theora
- MediaCoder Application to encode media files into many target formats, including Ogg Theora.
- SUPER General purpose converter application, also serves as a frontend to ffmpeg2theora.
- Freej Freej is a realtime video mixer. It can stream ogg theora vorbis live to icecast. Check here for more info.
- OggConvert is a small Gnome utility which uses GStreamer to convert (almost) any media file to Ogg Vorbis, Theora and Dirac.
Mac OS X
- XiphQT allows you to export from Quicktime, or any application supporting Quicktime (i.e. Final Cut Pro), to Ogg Theora/Vorbis.
- Simple Theora Encoder an ffmpeg2theora frontend
- Theora Hardware: List of hardware-players supporting Ogg Theora
- TheoraSoftwarePlayers: List of media players that can play Ogg Theora
- TheoraSoftwareEncoders: List of software that can encode to Ogg Theora
- TheoraDecoders: List of decoder implementations
- TheoraEncoders: List of encoder implementations
- List of Theora videos: Get some files to see what the codec's like
- Games that use Theora: List of known games that use Theora
- TheoraTestsuite: Different samples to test player compliance