Stuff you ignore in a DAW because you think 3rd party is always better or just didn't pay attention to it.
Sonar/Cakewalk
-Cyclone seemed like it was ahead of its time. It's still in there. Not really sure how to use it
-The hidden plugins like the Percussion strip 64
-Sonitus Plugins
- Beatscape was a useful Rex player at one time.
FL Studio Everything
- Harmor and Sytrus are their flagship synth but after going through all of them I didn't realize you can create music with them. Their effects are overrated and seem to add new ones.
Live Suite
-Max4Live Takes some time to learn
Reason Studios
-Subtractor, Thor, and Redrum are still a beast to use. They can suffer from neglect due to the shiny REs. Redrum is my favorite easy to use drum sampler.
I do come across many tutorials and templates using stock devices. I guess some effects in Reaper are popular. Logic seems to have its own share. I remember when DAWs were not complete and you had to buy additional plugins. Some plugins at one time that were in DAWs were no better than demo software.