Anachron  
   Offers companies the ability to provide their customers with online billing.
   http://www.anachron.com/

Idigibill.com  
   Offers solutions to manage subscriptions or other recurring-billing based settlements. Creates customized solutions to match requested billing cycles.
   http://www.idigibill.com/

Netbilling Processing Services  
   Provides Internet-based credit card processing for online merchants. Features include membership site management, a free shopping cart system and 24-hour customer service.
   http://www.netbilling.com/

RecipNet  
   An online reciprocal-transaction processing network.
   http://www.recipnet.com/

Rent to Pay  
   ACH and bankcard transactions for collection of monthly rents.
   http://renttopay.com

Verotel Billing Solutions  
   Offers third party credit card processing, 900 number billing and support for subsciption-based sites.
   http://www.verotel.com/

CC2You.com  
   Provides online credit card processing for membership sites, shopping cart or services.
   http://www.cc2you.com

GloBill-Systems  
   Offers check processing, phone billing and merchant accounts for membership web sites.
   http://www.globill-systems.com/