Mobian
The Mobian project aims to bring Debian to mobile devices. Over time, the idea is to minimize the Mobian specific pieces by “upstreaming” customization to the original projects. It is maintained by 2 distinct (but overlapping) teams:
the Mobian team is responsible for maintaining downstream packages (containing non-upstreamable patches and/or not ready for inclusion into Debian) and non-packaging tasks, such as image generation and distribution
the DebianOnMobile team maintains packages which are already part of the Debian archive.
For a list of supported devices, along with installation instructions for each one, see Supported Devices.
Also see Mobian on pine64 wiki
Project wiki (community maintained): https://wiki.mobian.org/
IRC: #mobian on OFTC
Matrix.org: #mobian:matrix.org
Telegram: https://t.me/mobian_project
Salsa: https://salsa.debian.org/Mobian-team/
GitLab (deprecated as of 2022-07-08): https://gitlab.com/mobian1