OpenPro product is written using Open Source technology called L.A.M.P. commonly known as the LAMP stack.   This includes 4 of the world most popular open source products,    Linux Apache MySQL and PHP . Today, this combination run over 45% of the internet webs sites today.  

The LAMP stack is basically the combination of four popular open source technologies that together produce a powerful application serving platform. LAMP is often seen as the best open source solution to compete with proprietary and commercial products, such as Windows, IIS, and .NET. LAMP is also known for its complete security and reliability, unlike some of those commercial products.  Certainly its low cost is appealing, but the open source nature, making for free and easy development and deployment, is a much more attractive reason to use the technology. This base product makes it so OpenPro can sell its comprehensive product that completes with SAP, ORACLE and 10% of the cost.]

Other locations where you can find information on LAMP are located below.

Other websites to review

IBM LAMP technology site

IBM PHP details site

Organizations

LAMPsig.org