The SSF 'engines' are process oriented parallel discrete event simulators employing efficient multithreaded software architectures, and provably scalable conservative synchronization algorithms. Several independent implementations of the SSF API have provided a thorough validation of the semantics of the underlying execution model. Raceway High-performance commercial implementation of the Java SSF API from Renesys Corp. Raceway download page. JSSF Reference implementation of the Java SSF API from Cooperating Systems Corp. (22 April 2000) Contact: info@cooperate.com CSSF Reference implementation of the C++ SSF API from Cooperating Systems Corp. (16 May 2000) Contact: info@cooperate.com DaSSF High performance Dartmouth implementation of the C++ SSF API (with preprocessor directives) based on custom designed, source-code level threads. Available from the DaSSF web site. See these sites for up-to-date information on terms. The SSF Research Network does not endorse or warranty any particular SSF implementation; these links are provided as a convenience only.