  The Planetary project develops a general framework - the Planetary system -
for social semantic portals that support users in interacting with STEM
(Science/Technology/Engineering/Mathematics) documents. Developed from an
initial attempt to replace the aging portal of PlanetMath.org with a mashup of
existing MKM technologies, the Planetary system is now in a state, where it can
serve as a basis for various eMath3.0 portals, ranging from eLearning systems
over scientific archives to semantic help systems.
