The OpenBeOS project begins with its first start message on the mailing list. It later becomes Haiku.
Source: https://www.haiku-os.org/about/history
ID: openbeos-start
PowerShell is announced as an open-source project for Windows, Linux and macOS.
Source: https://devblogs.microsoft.com/powershell/powershell-on-linux-and-open-source-2/
ID: powershell-open-source