App launcher Zazu offers many many features and plugins and seems to be active, plus cross-platform.
A fully extensible and open source launcher for hackers, creators and dabblers. It comes with sane defaults to make it useful out of the box. But everything can be changed to fit your needs. Don’t let others tell you the best way to be productive, configure it to be perfect for you.
It’s another bloody electron app, so you can kiss your RAM goodbye.
Kupfer is an interface for quick and convenient access to applications and their documents.
The most typical use is to find a specific application and launch it. We have tried to make Kupfer easy to extend with plugins so that this quick-access paradigm can be extended to many more objects than just applications.
[…] Kupfer is a Python program that allows loading extension modules at runtime. A plugin is equivalent to one Python module implemented as one
.pyfile or as a Python package.
Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.