OSM History Viewer and OSM Route Manager are two ancient tools that help visualising and analysing changesets and route relations. In particular, they provide the following features:
* Show the geographic and tag changes that a specific changeset has caused
* Render a route relation (with support for nested relations), detect gaps and inconsistencies, and export the route as GPX
* Analyze the history of relation members and show who last edited (and is thus to blame for) which section of the ...