ArKuroba is a fast Android app for browsing imageboards archives, such as yuki.la and 4plebs. It is based upon Adamantcheese's Kuroba which is in turn based on Clover by Floens, but is setup to work with archives.
Floens - For the original Clover app Adamantcheese - For the much improved Kuroba app K1rakishou - Many features included in Kuroba and thus ArKuroba were possible thanks to them.
Kuroba is GPLv3, licenses of the used libraries. ArKuroba is GPLv3, [license of the used libraries] (https://github.com/alteredgenome/ArKuroba/blob/multi-feature/Kuroba/app/src/main/assets/html/license.html).
Most of the codebase is identical to Kuroba with the only changes being inclusion of imageboard archives. If an issue comes up, check the Kuroba issues list to see if it is already addressed. If not, issue a request here, however I may just push it forward to Adamantcheese if it is an issue present in the core Kuroba codebase.