ROI Corporation markets software and services through its' subsidiaries to users of the IBM AS/400 midrange computer enabling them to implement high Return-On-Investment applications by connecting real-time devices. These merchant and financial systems and services are typically used in applications related to retail, mail and phone order, and Internet e-commerce. The IBM midrange systems software is categorized as "e-transaction middleware," meaning that it provides the connectivity and communications to facilitate the processing of electronic transactions, primarily related to credit card, debit card, and check processing.

Included in the ROI family of companies are:

Net400, Inc. e-mail software empower green screen users with e-mail ability comparable to PC e-mail clients. Net400 enables applications to use e-mail as a productive e-commerce resource.
GO Software, Inc. created the award-winning PCCharge™ Products for payment processing software. GO recently introduced RiTA Server, a Java-based payment engine for integration with any commerce application
S.A.F.E. Systems, Inc. provides a host-based, mag stripe, stored-value card, and markets credit card processing, stored value, gift card, coupon, and customer affinity/loyalty programs.