Web services

SOAP

SOAP ("Simple Object Access Protocol") is a lightweight protocol for exchange of information in a decentralized, distributed environment.

XML-RPC

Apache XML-RPC is a Java implementation of XML-RPC, a popular protocol that uses XML over HTTP to implement remote procedure calls.

Mono

Mono is a comprehensive open source development platform based on the .NET framework that allows developers to build Linux and cross-platform applications with unprecedented productivity. Mono's .NET implementation is based on the ECMA standards for C# and the Common Language Infrastructure. Sponsored by Novell and led by Miguel de Icaza, the Mono project has an active and enthusiastic contributing community. Mono includes both developer tools and the infrastructure needed to run .NET client and server applications.

Mason

Mason is a powerful Perl-based web site development and delivery engine. With Mason you can embed Perl code in your HTML and construct pages from shared, reusable components.