Vis5D:
Vis5D is freely available visualization system for 3-D time-dependent multi-variable datasets of gridded data
Originally developed for meteorological applications
Active open source project: regular versions’ update (v.5.2), mail list, a number of versions customized by users
Supports basic techniques of volume rendering (including slicing, isosurfacing, vertical profiling, node probing)
Ported to major brands of UNIX, WinNT, Lunix, OS/2
Emerging cross-platform WWW-standard for operational 3-D time-dependent data (meteorology, space weather)