CVoiceControl is a speech recognition system that allows the user to connect spoken commands to Unix commands.

Openmind (Freespeech) is a free speech recognition project for Linux It will be designed so that it can be easily integrated into any application or windowmanager as well as the kde and gnome desktop environments

is a machine-learning library with speech recognition tools (embedded training and large vocabulary decoding).

a freely available, modular, state-of-the-art speech recognition system.

collects transcribed speech (to create a speech corpus) for the creation of acoustic models for Free and Open Source speech recognition engines.