There is a sea of synths to use these days, Serum probably being the most popular in the techno world but personally ive always been a massive fan of Pigments from Arturia. Theyve just released a free update for all owners to Pigments 6 and it brings some very welcome additions!
Check out the quick overview :
Pigments is so well put together, the UI is very user friendly and the options are always growing. Its a very worthwhile investment!!
Pigments is currently 50% off at the time of this post so head over and check it out at Arturia – Pigments