Zed editor's integrated assistant with collaborative agent panels and a modern Rust-native UI. Differentiated by speed and the threads-style chat model.
From Wikipedia
Zed is an open-source code editor for Linux, macOS, and Windows written using the Rust programming language. It was started by Nathan Sobo, one of the creators of Atom, and is developed by Zed Industries. The editor itself is free to use, but users must pay to use some of the AI features.