Mozilla Thunderbird
Mozilla Thunderbird is a free and open-source email client for Windows, Mac, and Linux.
Mac
Send books, documents from PC to Kindle
Send books, documents from PC to Kindle using the Send to Kindle app for desktop.
Send to Kindle
Send to Kindle is the official app from Amazon which helps you easily send books, personal documents to your Kindle from your PC or Mac computer.
Record screen on computer with OBS Studio
Create video tutorials, demos, record screen videos on computer with OBS Studio.
Extract audio from video using Audacity
Extract audio or music from videos using Audacity on windows PC and Mac computers.
Avidemux video editor
Avidemux is a free, open source cross-platform video editor for Microsoft Windows, Linux, Mac OS, and BSD.