Take a look at https://mrchromebox.tech, particularly the "Supported Devices" page for models that can be upgraded to a firmware allowing the install of other OSes. Chromeboxes and Chromebooks by default prevent the user from installing and running anything except ChromeOS, which is a lot less powerful than Linux and others, but thankfully that limitation can be worked around. I've repurposed a good number of them, mainly Asus and HP ones, by following the instructions at that site, and never encountered any problems.

I also have all my Raspberries collecting dust after I swapped the last working one running Kodi with a Asus CN62 Chromebox: the performance difference is huge.