Jide Technology wants to give as many users the option to try out its own flavor of Android. This involved rolling out the 2.0 Beta to PC devices about a month ago with plenty of features that were missing from the alpha when we tested it a couple of months prior. But you don't have to have a PC to test Remix now as the OS has been released in beta for the Nexus 9 and Nexus 10. (Jide had previously released Remix OS 1.5 to these tablets, so this isn't the first time its software becomes available for them.)
The pages and downloads are available on Jide's website. For the Nexus 9, you can head to the landing page and grab the 528MB file then check the flashing instructions and participate in the conversation thread. And if you have the Nexus 10, you'll only need a 306MB download from this page and the instructions in this forum thread. Remember though to back up all of your data and make sure you know your way back to regular Android in case you don't like Remix OS. This is still beta software so you'll likely face some quirks and limitations while using it. It might be an excellent way to revive your aging and forgotten Nexus 10 though and see what Remix OS is all about.
Jide is also releasing a stable version of Remix OS 2.0 for its own Ultratablet (the one that was kickstarted last year) as an OTA update. The short details are available on the Remix forum on XDA-Developers.