Yet another somewhat obscure After Effects filter surfaced recently: Fulldome, from the Navegar Foundation in Portugal, which seems similar to the Digistar 3 Virtual Projector Plug-in from Evans & Sutherland.
Already at version 2.0 in September 2007, Fulldome (Win/Mac) is a compositing plug-in for immersive environments. This tool converts the standard rectangular workspace to a spherical workspace, allowing the user to produce content for spherical screens, such as planetarium domes, which can occupy all 180ºx360º of the spectator field of view, or even the entire 360ºx360º. Various input and output master projections are available.
There seems to be a version for Cinema 4D too.