THINK Subscription - Provides services and technology to manage subscriptions, memberships, and time-based products on the web. Hallmark Data Systems - Offers circulation fulfillment services for business publications. Datasystem Solutions, Inc. - Produces subscription, inventory management, and circulation fulfillment software for online and print publishers. Stark Services - Provides subscription and circulation fulfillment and publishing services for both B2B and consumer publishers. Mendon Associates Inc. - In-house circulation fulfillment software, readership research and contract publishing solutions for periodical publishers. iSubscribe - Provider of full-featured hosted subscription management and premium content authentication solution. Publish2Profit.com - Provider of Sequel Subscription Sales Software product for subscription management. Advantage Computing Systems - Provider of in-house circulation and fulfillment software. Modules are available for subscriptions, memberships, product orders, advertising, newsstand, promotion/list management, sales analysis, and e-commerce. DW Alliance LLC - Provider of subscription management solutions for website and print periodicals. Independent Fulfillment Service - Offers subscription and circulation management and other services. Subscriptions Strategy - Advice for publishers on subscriptions marketing, copywriting and creating direct marketing promotions.