You mentioned SoftMaker Office on your homepage, which IMHO is for many reasons the best M$O alternative (available for Windows, Linux, and Android -> apps TextMaker Mobile, PlanMaker Mobile, Presentations Mobile).
You don't mention SoftMaker's free office suite called FreeOffice (Windows, Linux) which has a few less features than the commercial SoftMaker Office, but will be appropriate for most office users; it's fast, feature-packed, and needs just 58MB. Would be cool if you list it:
freeoffice.com