Actually, Olind as Jobsapp, they are much more complicated, lot of features and functions were added, About Jobright, You can say it's an enhanced version of jobroller default version, we decided to make it after lot of requests to create something basic with the same layout and structure of Jobroller ( Mainly, The home page that they require no tabs in it). Also, Jobright came with some good new features like:
Search bar widget ( You need no plugin to use it, it's built in function.
Slideshow banner: ( no plugin required, managed from the admin ).
We changed the pagination for jobright, to numbers instead of previous/next page.
And we maintained a new look-n-feel for all the interface.
So technically, Jobright is not same as Olinda and Jobsapp.they are different in the interface, and the extra functions according to the taste of the bloggers and niches hunters that -they said- they are tired of the duplicates job boards' interfaces of some local competitors that they use same default jobroller one.
If the user want something more advanced, I suggest to get olinda or jobsapp, but in case they like same layout with new design, they better take Jobright ( if they like if ofcourse
I hope I could answer your question, else, please feel free to ask me at any time.