ripgrep is faster than {grep, ag, git grep, ucg, pt, sift}. There is also ripgrep-all which is essentially the same, but for more document types (eg. PDF, docx, etc)
Color: From Hexcodes to Eyeballs, a long and very interesting read.
apertus.org home of FOSS, open hardware, community-driven, professional digital cinema and imaging tools. They maintain AXIOM Beta, a professional digital cinema camera built around FOSS and open hardware licenses.
darlinghq is a translation layer that lets you run macOS software on Linux
examine.com — Nutrition and supplement information you can trust
Sqids (pronounced "squids") is an open-source library that lets you generate YouTube-looking IDs from numbers
cssanimotion lets you create CSS animations visually, by dragging, resizing, rotating, clipping and more, including a keyframes editor
ansel is an open-source photo-editing software for digital artists, designed to help you achieve your own interpretation of raw digital photographs.