AVNI provides free web-based and backend code access to tools, techniques, models and data related to global Earth sciences. It is a software ecosystem for analyzing and interpreting planetary models and data sets that were initially designed for the three-dimensional reference Earth model project (REM3D). The codes are primarily written in Python with interfaces to legacy routines in C and Fortran. Some installation files as well as applets and API access require registration. Checkout the links below for more information.