Maitreya is an application for Western and Vedic Astrology (Jyotish). The Vedic part supports many parts of classical Vedic astrology (according to Parasara) and some items of Jaimini Astrology. The Western part supports, among others, the systems of Ebertin and Witte (Uranian astrology).
Cerridwen provides geocentric planetary data suitable for a broad spectrum of astronomical and astrological applications, with a focus on our solar system. Among its data you will find, for example, the time of the next sunrise or that of the last full moon, or simply the current tropical position of the sun. It comes with a simple command-line utility and a JSON server, but is also designed to serve as a basis for your own application.