UAD-2 DSP processors provide plenty of plug-in power for your DAW, and Universal Audio makes by far the best plug-in emulations of classic studio hardware. Choose between Quad and Octo models with 4 or 8 powerful DSP processors, respectively.
UAD-2 is available as a PCIe card for Mac and Windows or as external devices with Thunderbolt (Mac), USB-3 (Win) or Firewire (Mac / Win).
You buy plug-ins in UA's full online store, but you get the first ones a little cheaper if you choose one of the Custom models, which includes 3 optional and free plug-ins.
With the Ultimate editions, you get the ultimate total collection of UAD plug-ins.