Already posted by someone else but reposting about Tundra tracker.

https://twitter.com/RtoVR/status/1347313258538147847

https://www.roadtovr.com/tundra-tracker-vive-tracker-alternative-steamvr-tracking/

"Tundra Tracker Aims for Smaller, Cheaper Alternative to Vive Tracker for SteamVR Tracking "