Look for files that start with ___plugins (or similar), although they only contain "real" plugins, so those tiddlers that affect behaviour (such as the view template) should be hunted down yourself. I think this command will help you find these tiddlers:
grep -l '\$:/tags' *.tid -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/92a4ea8d-6b39-417f-9b3a-dc3467bd37d4n%40googlegroups.com.