Until further notice, all new downloads in the DDL subforums in akiba-online MUST contain a ryushare link. All new threads for new downloads without a ryushare link will be deleted. For more information see this thread
Maybe you find some information at http://sougouwiki.com/.
Lately I recognized that the Japanese version of wikipedia is also a good source. If you can't read Japanese you can also use Google Translate to translate the website.