I’m using Hermes at the moment - it comes with lots of tools already baked in for the agent to use - for example web and browser access just worked, rather than having to mess around loads with config scripts and plugins.

I’ve also tried OpenCode (similar but a bit less so) and Pi (fast but you have to add lots of features yourself which is a bit of a pain). Claude Code can also be pointed at a local model and works, but the default system prompt is huge. (~140k of text when I extracted mine, IIRC.)