MekHQ has a pretty good, interactive, map that can handle calculating distances, jumps necessary, etc.
It also calculates jump times based on the sun type (which is canon for the ~1/3 of planets that have published data and for now a default for the rest). In some cases, the positioning of the planets could be improved (and there are plans to do so), but overall it is about as accurate as you're going to be seeing anywhere.
There are also plans to make it easier to change factions. Currently that would have to be accomplished by manually changing the planets.xml file (which is relatively simple since it is an XML document). Otherwise, it updates the map based on the date you've selected and should follow canon or be as close as possible (not all faction changes are 100% in yet, there's a lot to work with.)
Still, it is a very handy tool. And planets with published data, have their information entered (sun type, gravity, pressure, temp, recharge stations, etc.)