MicMute is described as 'small program that will enable you to easily manage the level of a connected microphone. The software uses tray notification balloons and it also has a sound signal option you can activate'. There are five alternatives to MicMute for Windows and Mac. The best alternative is AHK MicMute, which is both free and Open Source. Other great apps like MicMute are Shush (Paid), MuteMyMic (Free), Talk Toggle (Paid) and MicSwitch (Free, Open Source).
Quickly mute and unmute your microphone through a user-configurable hot key. Keep your voice chats crystal clear and free of noise. Fully configurable - Customize any hot key of your choice (supports both keyboard and mouse button combinations).
MicSwitch allows you to mute/unmute your system microphone using a predefined system-wide hotkey which will affect any program that uses the microphone (no more heavy breathing during Skype conferences, hooray!).