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The Open Source Sunspots Organizer is a php interface designed to register all data acquired from sunspots' observation. It supports a login system to separate observers. As a php based interface it needs a web server to run.
Project Galileo at Sourceforge.net aims to provide developers a unique opportunity to develop open source software for an on-line telescope for schools across the UK. See http://www.projectgalileo.org.uk for more details.
Ciclope Planetarium is a web-based planetarium that provides a simulation of the sky from any location at any time and date. Developed using Google Maps API & AJAX. Available in PHP & J2EE. Integrated in the Ciclope Stars project (www.ciclope.info/stars)