Famitracker is a pretty good tool in that case: http://famitracker.com/
I also like http://bedroomproducersblog.com/ They have a pretty good list of free and affordable resources.
Those two links are probably the best places to start. VST4Free has some good plugins, but they are all (legally) free and community-made, and you get what you pay for. http://www.vst4free.com/
I guess it also depends on your desired workflow. For the piece I posted above, I programmed everything into physical synths that were chained together, and ran the line straight into a DI box. It sounds like hardware because it is hardware. The one I’m going to post below this was composed in Sibelius, exported from that as midi into Acid Studio, and I assigned a variety of different plugins from VST4Free to the parts, so it was all software. It doesn’t sound as authentic, but done in that manner there’s a lot more flexibility, and you can jump to any sonic palate you like