I'm looking for initiatives pursuing mobile offline trip planning using a combination of public transit data and walking-routes. Thus far, without much success.
Osmand, seems to be closest, but the part for offline tripplanning isn't completely funded yet. I may contribute, but haven't got a clue about its viability.
I'm looking for any projects pursuing this, or papers (comfortable with reading the academic math-stuff) outlining this. Also roadblocks preventing this (or rather: making quick implementation unlikely), etc. welcome of course.
I'm 'only' looking to do offline trip planning within one city at a time, which obviously brings down complexity lot.
P.S: adapted question from question posted on opentripplanner-forum: https://groups.google.com/forum/?fromgroups=#!topic/opentripplanner-users/m6PGVRBA0eU