This page is a place to collect small mapping scripts that don't justify their own web pages.
Warning: I don't use gpxmgr much any more; I wrote it quickly to split tracks so they wouldn't crash Merkaartor. But I don't use Merkaartor any more (it depends on newer Qt libraries than I have, and that got to be too much hassle) and most of my GPX exploration now uses my programs pytopo and ellie, which don't require splitting the track files first.
PyTopo: explore tiled maps
Ellie: plot elevation from a GPS track