MinimogueVA is freeware, and a pretty rendition of a Minimoog.
I used it for quite a long time, but it IS 32-bit, and therefore you can sometimes get BitBridge weirdness when using it in a 64-bit Sonar install.
BUT, if you use it in a 32-bit install of Sonar, it sounds fabulous, particularly for free.
They also have an ARP2600VA as well, which is a free rendition of an ARP2600 - it too is 32-bit.
I would vouch for these 2 synths, used in a 32-bit Sonar, and potentially used with JBridge. (I began to have enough instances of weirdness using them in 64-bit Sonar with BitBridge that I stopped doing so. BUT, I never had those problems using either one in a 32-bit Sonar).
I have subsequently bought the Arturia V Collection, which comes with crazy good Moog synths, along with a total of something like 8-9 synths. I caught them on a 50% sale, I think it was $150.
Bob Bone