This is not exhaustive list of mainline Linux kernel effort around Samsung Exynos. It is rather a list of bookmarks of useful resources.

• IRC: #linux-exynos @ Libera.chat
• postmarketOS - Exynos mainline porting
• Replicant supporting several Samsung Galaxy mobiles
• Mainlining Samsung Galaxy S6 phones (Exynos7420) - Paweł Chmiel
• Exynos850 - Sam Protsenko
• Mainlining Samsung Galaxy S8 phones (Exynos8895) - Ivaylo Ivanov
• Starting the Samsung Galaxy Note 10.1 Journey - Viciouss (Exynos4412, Martin Juecker)
• Midas on Mainline (Galaxy S3 family, Exynos4412) - forkbomb/Simon Shields
• U-Boot for the Galaxy S3: an investigation - Wolfgang Wiedmeyer (Exynos4412, git)
• Mainlining Samsung Galaxy S phones (S5Pv210 chipset): Paweł Chmiel's Linux kernel and Jonathan Bakker's U-Boot
• Startup analysis of Exynos4412 SoC - Wang Xinlu (zh)
• wiki.tizen.org and TODO list
• Tizen Exynos Linux kernel git
• Hardkernel (Odroid) Linux kernel git
• Tobias Jakobi Linux kernel git