Lacona!

Cerebro is an open source and free electron-based productivity software alternative to Alfred and Spotlight. It is focused on speed and good UI and UX. In most cases you don't even need to open another application, because you can see results right in Cerebro, like google maps, IMDV movies or contact details.

LaunchBar is a smart and powerful, keyboard driven productivity utility that lets you access and control every aspect of your digital life. Whatever you want to get done on your Mac – with LaunchBar it’s only a few keystrokes away.

Zazu is a new open source productivity app, that allows developers to be in the drivers seat. Unlike other solutions, there is no built-in integrations, so every plugin has the full scope of what Zazu has to offer.

If you can see it, you can search it and share it from any device.Everything seen is remembered devices across all of your devices. Atlas pulls together all the threads of your digital life .Atlas Recall works with all the apps, websites, and services you love. No account authorizations required.Your digital life is more than just files. It’s the web pages, apps, emails, texts, chats, videos and more you use everyday. If you’ve seen it, you can search it with Atlas Recall

Krunner is a multi-function command line menu for the KDE Plasma Desktop.At times, it almost seems as you could manage all your computing from Krunner. Among other things, you can launch commands, open websites using the abbreviations defined in System Settings > Shortcuts > Web Shortcuts, send emails, convert units of measurements, open particular system settings, and view the date and time.