Inptools provides means to convert and reproject files in the EPANET INP format. It includes the shp2inp, inp2shp, epanet2csv, and inpproj commands. (EPANET is water supply network analysis software.)
EPANETL is a localized (translated) version of EPANET, a popular hydraulic analysis program which can be used to simulate water supply networks.
GHydraulics is a QGIS plugin which integrates EPANET for hydraulic analysis of water supply networks.
A VRML/X3D browser and a viewer/converter for other 3D model formats.
A command history suggestion box for BASH.