With the awesome RetroArch application for running emulators and all sorts coming to Steam, they now have a Playtest available you can opt into to try it out.
Using the new dedicated Steam Playtest feature announced by Valve in early November, developers can have a banner on their Steam store page letting users request access. So the Libretro team have put this up, and as of today it also has Linux builds available for testing.
- There will be no ‘Core Downloader’ in RetroArch, or anything that is not hosted on Steam in fact. To obtain cores, you need to install cores separately that we provide as ‘DLC’. These are all free just like RetroArch itself.
- RetroArch needs IPA is a free, open-source and cross-platform front-end for emulators, game engines, video games, media players and other applications. It is the reference implementation of the libretro API, designed to be fast, lightweight, portable and without dependencies.
- The Steam release of RetroArch will start out simply as a means of launching RetroArch from inside Steam, in a sort of Russian nesting doll manner of software launching other software.
All you have to do is go to the RetroArch Steam page, and look for this banner:

RetroArch is an open source and cross platform frontend/framework for emulators, game engines, video games, media players and other applications Visit the Store Page Most popular community and official content for the past week.
The way it's setup appears to give instant access, so you should be accepted instantly to then be able to see it switch over to saying 'Play Now', which then let's it download. The Linux build on Steam is using an AppImage, so it should work nicely across most Linux distributions.

Currently it only has a limited amount of emulator cores available. Fsviewer for mac. At release, they will be putting up more cores as free DLC to download to access more emulators.

Pictured - RetroArch on Steam for Linux.
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So far so good, everything appears to work pretty much as expected. Their Linux support has been in pretty great shape for some time now, so that's not exactly surprising. Still, having it on Steam is going to be a boon for the project as so many more people will be able to see and use it. Another great example of open source in action. Mame emulators for mac.
Retroarch Steam Reddit
Pictured - Golden Sun running through mGBA with RetroArch.
You can try it out on Steam or simply head to the actual RetroArch site for the main downloads.
Retroarch Steam Release Date
Article taken from GamingOnLinux.com.