Mic Drop is described as 'macOS menu bar app that allows you to quickly mute and unmute yourself using a keyboard shortcut. It works with every meeting app out there—from Zoom to Slack, FaceTime to Houseparty' and is an app in the Office & Productivity category. There are six alternatives to Mic Drop for Mac and Windows. The best alternative is AHK MicMute, which is both free and Open Source. Other great apps like Mic Drop are Shush (Paid), MuteMyMic (Free), MicSwitch (Free, Open Source) and Talk Toggle (Paid).
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!).
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).