The Apollo core is not open source.
There are some other pretty nice and featured 68k cores that are open source (TG68, WF68K30L etc.) but none that is really close to the features and performance of the Apollo 68080.
There are some other pretty nice and featured 68k cores that are open source (TG68, WF68K30L etc.) but none that is really close to the features and performance of the Apollo 68080.
If you do a little research you'll find out that there's plenty of "stay away" and "can't believe they haven't been sued into oblivion yet" indicators and all sorts of misleading claims and marketing.
My summary would be that it's a tightly-controlled, closed project lead by questionable people with well-documented histories of questionable practices including ignoring copyrights, distributing infringing software, deleting critical posts from their forums and putting out misleading information.
https://wiki.apollo-accelerators.com/doku.php/about_us:links