The source code is hosted on GitHub: https://github.com/MichaIng/DietPi The main website can be found at: https://dietpi.com/
The project released the new version DietPi v8.6 on July 2nd, 2022.
The highlights of this version are:
New hardware support for PINE64 Quartz64 Model A, Quartz64 Model B and the SOQuartz Compute Module.
Prometheus Node Exporter for hardware and OS metrics including HAProxy support.
Tailscale, a free cloud-hosted VPN service option.
ZeroTier, another free cloud-hosted VPN service.
Rclone, quasi the "rsync for cloud storage".
PiVPN with unattended first boot installation.
Amiberry updated to latest version (5.3).
The full release notes can be found at: https://dietpi.com/docs/releases/v8_6/