As the title says, check this out
For those who don't know, u-he is a serious company providing high quality plugins and has done so for linux for a long time.
Yes, they are neither free nor free but I have yet to see a crash of their plugins and if that was the case I'm sure that their support would be responding in no time.
Don't be fooled by the age of some of these plugins. They are continuously improved and still delivers. You can try before you buy, which is also nice.