airspace-checker aims at being able to check that a given flight did respect the different airspaces.
Its development is focused on French airspaces + paragliding/hanggliding.
Currently, only the converter from OpenAir format to ESRI Shapefile is (partly) working:
$ ./oair2shp.py france.txt france.shp
converts the OpenAir file 'france.txt' to 'franche.shp' shapefile.
This shapefile can be converted to KML using ogr2ogr tool:
$ ogr2ogr -f KML france.kml france.shp france
The GDAL/OGR bindings for python ('python-gdal' package in Debian based distros).
The 'gdal-bin' package can be useful (it contains the 'ogr2ogr' tool).