The National Initiative for Democracy
The National Initiative for Democracy creates a 'Legislature of the People' or 'Direct Democracy' using the ballot initiative, and establishes a legislative partnership between the People and their elected representatives.
http://ni4d.us/
Initiative and Referendum Institute
Society, Politics, Democracy, Direct Democracy - Initiative and Referendum Institute. Non-profit non-partisan research and educational organization dedicated to the expansion of the initiative and referendum process in the US.
https://www.iandrinstitute.org/
I&R: Citizens' Initiative and Referendum
Society, Politics, Democracy, Direct Democracy - IR: Citizens' Initiative and Referendum. Proposals and campaign resources for direct democracy such as citizens' initiative, referendum, and recall in Great Britain and Northern Ireland.
http://www.iniref.org/
Direct Democracy meeting place
Society, Politics, Democracy, Direct Democracy - DDemocracy Meeting Place. Large list of direct democracy sites arranged by country, with new URL's added by visitors.
http://democracy.mkolar.org/