Aciqura

Aciqra is a free and open source virtual planetarium and sky mapping program for simulating objects in the sky. It is intended for users who regularly view the sky through a telescope or binoculars, whether visually or with a camera, and need software to help them decide what to view and when.

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Celestia

Open Source Planetarium Tool

Celestia is an application for real-time 3D visualization of space, with a detailed model of the solar system, over 100,000 stars, more than 10,000 galaxies, and an extension mechanism for adding more objects. Celestia allows users to travel through an extensive universe, modeled after reality, at any speed, in any direction and at any time in history. Celestia displays and interacts with objects ranging in scale from small spacecraft to entire galaxies in three dimensions using OpenGL, from perspectives which would not be possible from a classic planetarium or other ground-based display.

Pauker

Open source Flashcard App

Pauker is a Java-based flashcard app uses the Leitner Method to exercise your ultra-short-term, short-term, and long-term memory. Although most of the pre-existing card sets train you in a foreign language, it does offer some STEM-related sets for mathematics, chemistry and nursing.

ChronosXP

Open Source Astronomy Program

ChronosXP is a planetary hours astrology program for Windows. It runs from the system tray where it displays a glyph corresponding to the current planetary hour. Planetary hours/days can also be viewed for any given time or location.