This is for 2004 version of the game, but probably the most active open source project https://github.com/2004scape https://github.com/2004scape Also Runelite

This is for 2004 version of the game, but probably the most active open source project https://github.com/2004scape https://github.com/2004scape Also Runelite isn’t open source client per se, its just open source client wrapper that makes many functions available through stable API and adds plugins.