WinWWZ is a Windows XP-based tool for period analysis of variable stars or other time series data using wavelets. It is designed to work with data from the AAVSO International Database  downloaded via the official form to download data  but will work with most generic time series data sets and supports flexible input formats.
Acknowledgements: The AAVSO is grateful to Geir Klingenberg and to the late Lisa Henkel (1970-2010) for help developing this software. The AAVSO also acknowledges the American Astronomical Society's Small Research Grant program and in particular the Gaposhkin Fund for supporting development of this software.
Windows ME and 98 users: This program is written in Microsoft's VB.Net language. It should run on most Windows XP and 2000 machines with no trouble. However, Windows Me, 9x and early home editions of XP may get it to work by installing a library called the Microsoft VB.Net Framework. If you are unsure, just try to install WinWWZ. If it doesn't work, then download the VB.Net Framework at the URL below. We do not offer promises that it will work. Our results have been hit and miss.