With infrequent posting on the forums, only 3-4 plugins have been posted here, however over 20 have been developed so far!
Anything including plugins, gateways, modules, and messengers.
However since nothing new has been posted for a while, following a release of the new "Bulk Download Invoices" plugin (you can find it here: https://marketplace.blesta.com/#/extensions/197-Bulk%20Download%20Invoices), here's bit of a discount on all of the plugins (except this new one):
USE CODE NEWRELEASE2304 FOR 25% OFF PLUGINS FOUND AT THIS PAGE Blesta Plugins | Code Cats Ltd (code-cats.com) - https://my.code-cats.com/order/main/packages/blesta_plugins/?group_id=21