GRAMPS (an abbreviation for “Genealogy Research and Analysis Management Programming System”) was originally developed as a rather full-featured Linux genealogy program and later was ported to Macintosh, Windows, BSD UNIX and Solaris. GRAMPS is always available free of charge. (You can find my previous articles about GRAMPS by starting at https://goo.gl/gVUE9d.)
GRAMPS also has been available as a cloud-based program for some time. In theory, you should be able to use the cloud-based version of GRAMPS with any Android, Apple iOS (specifically iPad), Chromebook, Windows, Macintosh, or Linux computer. Since it runs from the cloud, no software installation in your computing device is required. Best of all, GRAMPS is available FREE of charge.