FreeImage is a library project for developers who would like to support popular graphics image formats (PNG, JPEG, TIFF, BMP and others). Some highlights are: extremely simple in use, not limited to the local PC (unique FreeImageIO) and Plugin driven!
Geodesy based library (geodetic and geocentric functions)
geoStarsLib has functions for dealing with many geodesy-based problems found in positioning, pointing, and surveying situations. It is useful to determine absolute position on the earth, pointing vectors, coordinate transformations, and other functions.
This project produces an Extension and VBA module that allows ESRIs ArcMap (v8.x) product to access Open Source Postgresql/PostGIS spatial data tables. Includes importing tables and exporting/updating back to the database. Currently using Postgresql OD