Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
3Cols - Manage your code snippets in the cloud fast, easy and free for personal use forever.
Invision - Prototyping and collaboration for design teams
Lepton - Lepton image compression: saving 22% losslessly from images at 15MB/s
Sketch - Professional digital design for Mac.
Boostnote - Boostnote is an open-source note-taking app.