WARNING: This project has long-since been unmaintained and is very unlikely to still be usable as-is on modern versions of Gnome. Good luck, though!
Push-to-talk for Linux
This gnome application allows one to assign a key (by default F12) that will unmute one's microphone while pushed.
On Ubuntu, this is as easy as running
sudo apt-get install python-setuptools python-gtk2 python-xlib.
sudo python setup.py install.
If the application immediately closes with the message "You must log-out and log-in again for your system tray icon to appear.", log-out and log-back in again; a system settings change was required.
Changing the Push-to-talk Key
- Right-click on the microphone icon in your system tray.
- Click 'Set Key'.
- Press the key you'd like to use.