Arc .fun is an open-source agents framework built on Rust.

Arc .fun is building an open-source agents framework named Rig. This is the only agent framework built on Rust at the moment. This is a big deal because Rust is Solana’s native language.
What Make $ARC Interesting?
The Rust language helps optimize performance due to zero-cost abstractions.
Rig Framework has proved to outperform Langchain on memory and cold start times.
@0xCygaar is contributing to The Rig Github. He's a core contributor to Abstract Chain.