A plugin that generates nice charts from GPX-files. It put's all information about heartrate, cadence, elevation and speed into one chart.
There are several ways. You can download it from (http://plugins.svn.wordpress.org/gpx2chart/trunk/) or use the prepacked version from WordPress when selecting "other versions" => development version. This will represent a more or less stable release. If you really want to use the bleeding-edge you need to download from GitHub. My primary development is done on this plattform. I've also added a scripts to update the subversion-directory on wordpress. So the different steps are: local copy on my computer -> github -> wordpress-svn trunk -> wordpress-svn tag tagged versions on github have the same code-base like wordpress tags.
Yes, there is kind of a roadmap. But the order depends on my time.
Yes, of course! I would really appreciate this. But I'm very sorry to tell, that the interfaces for additional rendering plugins are not finalized yet. They are also not really well documented. Please get in contact with me if you plan to add your own rendering engine.