AriangAriaNg, a modern web frontend making aria2 easier to use.
AuthLogAttackMapTails the /var/log/auth.log, geolocates IPs found, and displays them on a web frontend.
webnettoolsWeb Net Tools is a web frontend for some useful command line tooling. It provides especially an web frontend for tools like testssl.sh and nmap.
BaNGBackup Next Generation for Linux & Mac using rsync (support hardlinks and btrfs snapshots), Web-Frontend, Statistics, History-Merger)
node-qemu-serverFree GUI / Frontend / Management tool for simple setup, configure and control virtual machines (qemu / kvm) within your HTML5 Webbrowser. Virtualization with Node.js / Currently under complete rewrite.
gdbfaceGDB web frontend written in Javascript