MuteMyMic is described as 'Provides a status bar icon for setting microphone input level, and hotkeys to mute/unmute'. There are five alternatives to MuteMyMic for Mac, Windows, Android and Android Tablet. The best alternative is Mic Drop. It's not free, so if you're looking for a free alternative, you could try Mute Speaker Phone. Other great apps like MuteMyMic are Shush (Paid), Talk Toggle (Paid) and Mutify (Paid).
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).
For those who are using the speaker-phone with your Android smart-phones all day long, very often you need to toggle your speaker-phone to mute and then un-mute many times per day. This app provides a simple way to do the toggling.