Please see my comment to the question: this is not a software-searching service. Nevertheless, I recently faced a big domain of information related to the question. I haven't done any serious research on the topic, but I can share some links you can start from.
First of all, this is related to the concept called
collaborative mapping:
Collaborative mapping — Wikipedia, the free encyclopedia[
^],
see also
Volunteered geographic information - Wikipedia, the free encyclopedia[
^].
Using one of the related products, collaborative free OpenStreetMap, I found some traces of the activity related to "personal travel routes" you are interested in. In particular, there is such thing as so called "public GPS traces":
OpenStreetMap - Wikipedia, the free encyclopedia[
^],
OpenStreetMap[
^],
OpenStreetMap | Public GPS traces[
^].
It suggests that "personal routes", in broader sense, can also be built and processed, if not on this site or with related services, but based on the same technology. To find out, you need to study the software used. As "
Software used in the production and presentation of OpenStreetMap data is available from many different projects and each may have its own licensing.", you need to study it. You can start here:
Software - OpenStreetMap Wiki[
^].
This way, you can dig out what's done in this field and accessible to the public, starting from these references. There is a number of other products, but I mentioned the only one based on open-source technology I know.
Good luck.
—SA