"a" and "for all" combined sounds too open-ended and vague. it would be better to remove the "a." i don't like ending with "for all"... it sounds like we're going to war.
i would suggest including something about it being offline and helping in developing countries; more people will be interested if it is helping others as well as being a resource they could use.
it would capture my interest, but the break between "free" and "open-source" seems to interrupt the flow of the title.
i like this title, but it emphasizes open-source when i believe more people would be motivated by "taking things offline."
ambivalent about this one ~ i like the words "free" and "all" but don't get any sense of the how/who/where...
too general, what is open-source? who is everyone? many might avoid reading more because of an unclear title.
too vague since there are so many free open-source educational resources out there.
get rid of "a"
an open-source offline distribution platform for free online education.
i just feel that it's generic and i could find a title like this for other platforms.