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Concurrent CPM-86 is a multitasking version of CP/M that evolved from Digital Researches' earlier multitasking MP/M product. A seperate add-on was available for 3.1 that added DOS compatiblity. This was integrated in to the product and it was renamed to Concurrent DOS.
Originally an optional module for Concurrent CP/M-86 3.1, this version of Digital Research's CP/M provided basic compatibility with PC-DOS in 1983. Simple DOS applications that did not require hardware access can be ran on this. A stripped down single tasking version was released as DOS Plus and later DR-DOS.
Gentus Linux is a distribution produced by ABIT, enhanced for use with their line of motherboards. (Enhanced IDE drivers, etc) ABIT's Gentus Linux was notorious for failing to comply with the GPL.
Ubuntu is a distribution based on Debian Linux that includes many common application programs. For a time it was considered relatively easy to use and set up compared to other distributions.