Battle of the open source synths on Linux: #Vitalium, #SurgeXT, #Synthv1, #Dexed, #ZynAddSubFX. There's also #Helm, but it's just a precursor of Vitalium (by the same developer). There are a couple more, but these are the most common or capable ones.
I wish there was some more development of Vitalium. The creator of #Vital dropped the v1 as GPL, and then he closed sourced it. The community didn't really do much with it.