These are artwork files related to osmocom projects. It includes logos of the various sub-projects and designs produced for related events.
The antenna is a modify version of the network wireless device from the GNOME 2.20 icon theme. The font used is for the text Yanone Kaffeesatz. Additional fonts might be used for event related designs.
The vector graphics (.svg files) include both the original text using the font, and the "path" version in case the font isn't install on your system. The raster graphics (.png files) for the logos have a common height of 250 pixels.