OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.
Slack - A messaging app for teams who see through the Earth!
Snagit - Screen Capture Software for Windows and Mac
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Mattermost - Mattermost is an open source alternative to Slack.