RawTherapee - RawTherapee is a free RAW converter and digital photo processing software.
Git Sketch Plugin - Version control for designers
CALCONIC_ - Build & add interactive calculators to your website! Choose from more than 50 premade calculators or build your own from scratch. No coding required. Free plan available. Zapier Integration. Publish Anywhere.
Anima App - Design, get feedback, convert to code, publish, iterate.
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.
Marvel for Sketch - Sync, play and record prototypes in Sketch!