assuming this is a legitimate question rather than a less serious call into the void, uh.

the theoretical answer? jcink coders primarily went into the real life community and largely out of free-for-use public releases. the shortest summary i can go into for both of these things is more or less.... real life is a bigger community than animanga is + it by-and-large just moved to jcink with v5's release rather than splitting down the middle the way animanga did; as a result, you have both more coders that exist there + more that cater specifically to jcink. the coding community has also shifted as the forum-based roleplay memberbase has aged, meaning that the vast majority of non-personal-use skins offered up are being sold as opposed to posted as a free-to-use resource, while posting templates are either increasingly being made obsolete (such as shippers moving into profiles + the application process or thread trackers being integrated into profile pages) or being bundled as matching templates for specific skins rather than general templates for general use (though some are offered as sets made for a certain skin that you can also purchase separately). there's other factors involved too, imo, but i think this is the quickest possible explanation i can give for why it is that there's so few animanga coders currently posting new free-to-use resources (as opposed to sticking to personal projects only or selling their coding via commission work + "general use" premades).

the practical answer? try cttw for free-for-use jcink templates + skins; they also have some guides intended to help new coders + skinners (though idk how useful it will be, depending on your base knowledge of html + css) as well as a "code marketplace" where a lot of coders link out to their shops and such. tumblr seems to be where a lot of coders have their portfolios for their shops (though idk how good they are at putting stuff in tags) with payhip being used for payment (since i think it can do partial payments upon completion of certain milestones, for commission work); this is where you're gonna find any "pay-to-use" premades or coders accepting commissions, i think (and if there's somewhere else the coders have gone now, hey, someone please correct me, it'd be good information to include).

and if that was just a call into the void, uh. my bad, i hope someone else finds this helpful asdfjkl;