Wise is an experimental Web-based notebook and simple computer algebra system based on the Pure programming language. The goal is to provide a digital scratchpad that makes manipulating symbolic expressions fast, accessible, and extensible. Wise is a bottom-up approach to symbolic math written entirely in C and Python. It does not depend on any external math software or libraries (such as Maxima, Axiom, Mathematica, etc.).
Libravatar is software that allows domain owners to control how avatars (profile pictures) are served to other Web sites. It implements a modified version of the Gravatar API, adding a few features such as federation, LDAP authentication, and OpenID support. Libravatar powers libravatar.org.