krunner-nix is a KRunner plugin (built with krunner-rs) that suggests and autocompletes programs that can be installed and run with Nix.
Simply activate KRunner (alt+f2 by default) and type in any program you want to run. This plugin would then list programs in Nixpkgs matching the entered query, and sort them by how close they are to the query.
By selecting a program (or by clicking the Run button), a Konsole window would be appear, showing any logs or build progress that nix run displays.
Alternatively, by clicking the Terminal button, a shell with the chosen app installed would be opened instead.
It even works with the default Application Launcher!
Dual-licensed under MIT/Apache 2.0.