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Rgis is an incubator for developing spatial packages. It contains early work in progress. More mature fledglings of Rgis, that now have their own R-forge sites, are: raster, gdistance, remotesensing, and geosphere.
The R-forge project contains a number of related packages. It is an incubator for package ideas, that might eventually grow-up and move out to their own repository. This has happend for raster, gdistance, and the packages in cropsim.
Most of these packages depend on the raster package that provides basic classes and methods for raster (grid) data manipulation. So you will need to install that package first if you want to use the others (install.packages("raster", repos="http://R-Forge.R-project.org"). The raster package itsels depends on sp and rgdal.
'geodata' is for easy access to on-line spatial data. We are currently working on links to GADM boundaries, SRTM, worlclim, and DCW data.
'RemoteSensing' contains remote sensing functions (right now mainly a set of vegetation indices).
'diversity' contains functions for the analysis of biodiversity data (not much there right now, and have a look at adehabitat instead if this is what you are looking for.), and will focus macroecology and niche modeling
The project summary page you can find here.