The TechCenter is a FREE AutoLisp source code repository from Coordinate Systems / Four Dimension Technologies, Bangalore, India. It offers over 400+ useful functions in the form of ready-to-use functions which can be used to build powerful programs quick and fast.
"Before you shoot off your Lisp queries, look here. Chances are that your solution already exists and is just a click away.", said Rakesh Rao, founder, Four Dimension Technologies, who has authored these Lisp routines. "These are the same Lisp routines used in our GeoTools product and are well-tested, bug-free and industry-quality", according to Rakesh Rao.
These functions are useful for a novice Lisp programmer trying to figure out how to construct programming statements for various common tasks as well as for the power user who needs ready-made routines for complex operations.
Special focus libraries cover a wide range of frequently needed tools for many mapping, surveying, and civil applications plus many useful tools for creating user interfaces, user inputs with validation, processing of CAD objects, math functions and so on.
The present collection of libraries are grouped into the following categories and this is being constantly revised and updated:
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TechCenter URL: http://www.coordsys.com/techcenter