Personally, I use Kontakt libraries for such sounds more often rather than actual VI synth replicas, but I have some of those in my collection as well. Speaking of Kontakt libraries, as a NI Komplete user, my favorite sources of analog synth sounds are probably Retro Machines MK2 and the new Analog Dreams libraries. I particulary like the "synth" sounds featured in Spitfire Audio's eDNA Earth and Albion series, although those are based on warped orchestral recordings rather than on actual synth sources. I'm very pleased with the synth sounds from some smaller developers such as CL-Projects and Karanyi too.
I can't say I'm much of a synth sounds programmer when working with virtual instruments and sample libraries, though I have experience in programming hardware devices for live performances. Speaking of VI synths, Monark comes to mind first, though I also have Vacuum Pro and Hybrid synths from AIR Music Technology. I think that their VI's are perhaps a bit underappreciated in comparison to many "bigger" names. Speaking of which, I'm really looking forward to toying with the new Massive X. Currently I cannot use it as my present CPU isn't compliant, but I will hopefully finally build a new system next month which will also allow me to explore that particular synth. From what I've heard in the demos, it is capable and contains a lot of sounds suitable for styles outside the EDM and similar genres, which is probably the main reason I find it interesting.