Ripple is a dedicated scripting language for the Semantic Web. Ripple programs not only query the Semantic Web, but also reside within it as RDF data structures, forming a global network of interlinked programs. Ripple is best classified as a relational stack language, closely related to functional stack languages such as Joy, Factor, and Cat. As a Semantic Web interface, Ripple is a fast, text-based linked data crawler and browser with all of the flexibility of a Turing-complete programming language.
SPL is a powerful scripting language. It features hashes, regular expressions, objects, exceptions, a built-in template language, and has a C-style syntax. It can be used stand-alone or embedded in other applications. The entire SPL toolchain (compiler, assembler, virtual machine, etc.) is pretty small (about 100k on x86 architectures). One of the more advanced VM features is the capability to dump the entire VM state to a file and resume later. It even is possible to resume on another machine with a different architecture.
Program D is a widely used AIML bot platform. It is feature-complete and well-tested. It supports unlimited multiple bots in a single server instance, and has an open-ended architecture for interacting via any interface imaginable. The standard release provides a J2EE Web application implementation. Drop-in listeners are available for IRC, AIM, and Yahoo!. It includes an automated testing framework for testing knowledge bases, and is packaged with an AIML Test Suite that verifies that the program itself complies to the AIML specification.