John
One plugin I recommend is the Voxengo Span which is free and very useful.
+1 Voxengo Span is an absolute must-have in the VST toolkit.
Mind you, I have to be completely honest and say that in my opinion, the newer version (2.5?) isn't half as good as the previous version (1.9). In particular, I find the customisation available on the old version to be far superior.
Even though the newest incarnation is available in 64bit, I still use the older 32bit version of 1.9. In fact I believe it's the only Bitbridged plug-in I now use at all in X2.
If anyone wants the .dll of this older version, just PM me your email
Edit - I have the manual for it as well.