
The GoogleTransitDataFeed Open Source Software project is an effort to offer tools for reading, writing, and converting to and from the Google Transit Feed Specification format, to help make public transit information projects more successful .

PdMarker is a Javascript library that extends the Google Maps API, making it easier to customize marker behaviour. A basic understanding of the Google Maps API is recommended

Use SAGE for studying a huge range of mathematics, including algebra, calculus, elementary to very advanced number theory, cryptography, numerical computation, commutative algebra, group theory, combinatorics, graph theory, and exact linear algebra.