Apps similar to CLK include RetroArch, which is free and open source. Other options are Retrom, Lemuroid, mGBA and VisualBoyAdvance. There's no shortage of Game Emulators like CLK, with more than 25 alternatives for Windows, Linux, Android, Mac and the web.
A fast, modular emulator frontend offering portability and extensive support for systems from arcade consoles to mobile platforms, featuring game engines like Doom and Quake, and capabilities for real-time rewinding and shader support on a variety of devices.
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Centralized game library management service, allowing you to host games on one device and connect multiple clients, supporting cross-platform play and emulation. Easily manage emulator profiles, with web client access for metadata and artwork showcase.
Lemuroid is an open-source emulation project based on Libretro. It's completely free, without ads and focused on ease of use and good user experience.
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mGBA is an open source emulator of the Game Boy Advance. The goals are speed and accuracy.
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VisualBoyAdvance (VBA) is a free software (GNU GPL) emulator targeted for the Game Boy, Super Game Boy, Game Boy Color, and Game Boy Advance handheld game consoles sold by Nintendo.
Discover a lifetime of gaming, the ultimate retro gaming experience with Antstream Arcade. Dive into a vast collection of over 1300 classic games, with new titles added every week.
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Fuse (the Free Unix Spectrum Emulator) was originally, and somewhat unsurprisingly, a ZX Spectrum emulator for Unix. However, it has now also been ported to Mac OS X, which may or may not count as a Unix variant depending on your advocacy position.
SkyEmu is a low level GameBoy, GameBoy Color and Game Boy Advance emulator. Its primary focus is to provide a good user experience through a good mixture of tradeoffs of accuracy, performance, features and usability.
Hatari is an Atari ST/STE/TT/Falcon emulator for GNU/Linux, BSD, Mac OS X, Windows and other systems which are supported by the SDL library.
JSSpeccy is an open-source ZX Spectrum emulator written in JavaScript for the browser. Games can be played online for free at the demo site or by embedding the scripts in a web page.
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RetroX is an Android application that will help you organize and play your own Retro Games with the less possible effort. Put your collection in your device and RetroX will take care of the rest.
