VStar is a multi-platform, easy-to-use variable star observation visualisation and analysis tool. Data can be read from a file or the AAVSO database, light curves and phase plots created, period analysis performed, and filters applied. Plugins can be developed, e.g. to make additional observation sources available.
See also:
VStar Overview in Variable Stars South November 2011 newsletter
Paul York's updated 5-star analysis, originally written by Aaron Price for Citizen Sky 2