By Free for non-commercial use, are you limited to licenses(MIT, Apache, 3-Clause BSD, etc) ?
I would suggest liberation sans, but they are far from covering all languages you have quoted. Here is the list of supported characters - http://www.fileformat.info/info/unicode/font/liberation_sans/list.htm - Using the search on your browser you will not find chinese or greek references for example.
Maybe Google Noto Sans? - https://github.com/googlei18n/noto-fonts/ . It's licensed OFL 1.1 and it have normal and condensed variations - https://www.google.com/get/noto/