There are 4 repositories under proof-of-time topic.
Chia blockchain python implementation (full node, farmer, harvester, timelord, and wallet)
chiarose(XCR) based on chia(XCH) source code fork, open source public chain
Salvia blockchain python implementation (full node, farmer, harvester, timelord, and wallet)
A curated list of awesome Nyzo resources
Fast Recursive SHA256
Open Source solution to generate everlasting blockchain evidence that a file exists at a certain date
Helps albon to reduce drag (phython metacode proof of concept)