Plugins are dotted around the internet on their authors websites generally.
For scytaleC search the web archive of this mailing list for a link to the updated version for use with .NET5 sdrsharp which the author posted.
For tetra decoder and many others then the website of Vasili, the author, at http://rtl-sdr.ru/ seems likley to be the one you want
a few others.....you know what they are so try using your favourite webcrawler ;)
Putting plugins into the Plugins sub-directory of your sdrsharp installation folder will, for most, allow them to be automatically initialised if you don't want to use the older plugins.xml initialisation
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