I wrote OmnySSH in Rust and Tauri to replace Termius for my daily work with servers, and it ships at 11MB. Each host is a live card with CPU, RAM, disk and uptime, pulled over the SSH connection you already have, so nothing gets installed on the server, and one click sets up an Ed25519 key and turns off password auth. None of the IPs in the screenshots are real: I built a streamer mode that swaps addresses for random ones so I can record my own VPS and my clients without exposing them.
