Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
tSIP - tomeko.net/software: SIP client for Windows.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Lingo - Empower Creation and Ensure Brand Consistency. Build and Share libraries of visual assets with your entire team — all from your desktop.
LightShot - The fastest way to take a customizable screenshot.