Albert!

Keypirinha is a fast launcher for keyboard ninjas on Windows.

Quicksilver is a fast and free Mac OS X productivity application that gives you the power to control your Mac quickly and elegantly. Quicksilver learns your habits, making your everyday chores simple and efficient.

A multi purpose launcher and more advanced and customizable freeware windows run replacement and more. Executor is available also as a portable app and can be integrated in LiberKey.

RecentX gives you fastest access to your files, folders, programs, websites and also clipboard history in Windows. What's special is that it automatically remembers your recent and favorite items so that you can access them faster than searching all the files, folders etc. You can assign tags to all of them. You will be surprised to see how much hassle it saves and makes computing really enjoyable. We have stuffed this app with innovations that will boost your productivity.

GNOME Do allows you to quickly search for many items present on your desktop or the web, and perform useful actions on those items.

Hain is an ALT + SPACE launcher for Windows that looks and works similar to Alfred.

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.

Kupfer is a command tool heavily inspired by Quicksilver ; you do not use it to search your files, you use it to summon an application or document quickly by typing the first parts of its name. Kupfer is written using Python and has a flexible architecture. Objects that it can access are implemented in plugins, and new plugins can be written quickly. The philosophy of Kupfer is simplicity. The implementation is simple, makes the easy things work first, and does not overdesign unnecessary parts of the program. When you run kupfer, it launches, then anytime you type Kupfers keybinding -- immediately its window is presented ready for a new query. »

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

Smartest way to work on your computer. Freeter is a productivity app that allows you to gather everything you need to work in one place and access them quickly and easily.

dmenu is a dynamic menu for X, originally designed for dwm. It manages large numbers of user-defined menu items efficiently.

Faster access to your favorite files, folders, programs, etc.

Mutate is a simple launcher inspired by Alfred for Ubuntu.Be more productive with hotkeys, keywords and file actions at your fingertips.