For robotics, "make robot OS" the first (most popular) donation target would be Open Robotics [1] that develop Robot operative system ROS/ROS2. De-facto standard at least in academia, some startups (for MVP), and institutes.

If you are more keen about the hardware side (imo this side probably require more funding if you really want to keep Robots OS, software can come later) I like Robot Studios work by Rob Knight [2], it's OS afaik, with projects such as DexHand [3]. Recently someone posted K-scale labs [4] as robot OS, but imo looks more like a well-funded SV startup that will go full OpenAI and close everything off as soon they hit R&D traction. (just my own impression from reading their docs & focus, happy to be proven wrong)

[1] https://www.openrobotics.org/

[2] https://www.therobotstudio.com/

[3] https://www.dexhand.org/

[4] https://www.kscale.dev/