there is no such a thing like a recommended list, it all just depends how you plan to use OSC for your products, and since everyone has different products to sell they have a different taste for contributions.
The bad thing is there are lots of people who just dont want to share their own made contributions, thats a pitty but we can live with it....lol
We just start to write it ourselfs which will become pretty easy if you keep on adding contributions ;)
Just ALWAYS remember to backup all files that has to be changed BEFORE you even start to add a contribution