Gray apps
MacBook Pro, macOS Sierra (10.12.5)
My searching suggests those are associated with Parallels Desktop.
Possible solution A:
http://kb.parallels.com/112798
Possible solution B:
http://kb.parallels.com/123952
If you need to contact Parallels for support, here's their support page with contact info and a search bar for their knowledgebase: http://www.parallels.com/products/desktop/support/
Im now using version:10.12.6
Solution B says that it is not possible to get rid of them but you can only group them together which is what I already did. Thank you for spending time to research my problem.
Gray apps