While Telegram’s TON and GRAM are delayed, TON OS, an operating system for the TON blockchain, is going to be open sourced on GitHub on May 7
Source: https://cointelegraph.com/news/telegrams-ton-os-to-go-open-source-on-github-tomorrow
Telegram’s TON OS to Go Open Source on GitHub Tomorrow
May 6, 2020
CoinTelegraph