Download demos of massive or fm8 and sample the sounds.
Or, download the sylenth demo, ni demos, and whatever other plugs you see people using then learn one of them very deeply and buy it. You don't need 20 synth plugins to make a bassline.
Or yeah... Kvr.
Edit: I use polyIblit when I'm on other people's computers...
Matrix 6R, JX8P, Mopho Desk, MKS-10, Minibrute; RME UCX, ADA-8000, Alesis Studio 32; Yamaha HS80M; DT770, QSC K8s; PCR-800, Alesis DM8 Pro, Maschine, Launchpad, Remote SL Zero Mk I; 3x SP-1 (modded RK47, K7, RK67),SM58, SM57, CM100, ; Ableton, Logic , Komplete 8 Ultimate; 24 Bass traps (OC 703, 705, Roxul)