Here's a list of some of the outside companies/third party developers that provide Jomres services.
Jomres Extras Third party plugins & gateways.
Forum user : Piranha
Jomres Plugins. Third party plugins & gateways.
Forum user : Rodrigo Rocco
Forum user Marhinhio
odys.biz Third party plugins.
Forum user : Sidebar
OSDCS Gateway/payment service plugins. By far the largest collection of payment gateways for Jomres.
RIJS Davies Third party plugins.
Forum user : pauldrijs