APLX is a very complete implementation of the APL programming language from MicroAPL. The company stopped producing it in 2016 and it has been taken over by Dyalog. While Dyalog charges for the new versions, the final version from MicroAPL is available for free at this page. It comes complete with several pdf manuals. For anyone who is interested in something completely different, I strongly suggest you get this while it is still available for free. It is available in 32 bit and 64 bit for linux, Mac and Windows.