I've released the first beta of OpenLC. It's version 0.6. It has several improvements over version 0.5: run database is redesigned (now using a mix of XML, NetCDF and HDF5), speed increase (up to 1500 trans/s in an Athlon 900), IMAP4 support, better and more configurable statistics, and last but not least much improved documentation!.
If you're interested in give it a try, download it from http://www.sourceforge.net/openlc
What is OpenLC?: OpenLC is a set of software tools designed to facilitate benchmarking and stress testing of a wide variety of information servers (such as web, email, FTP, LDAP, databases, and so on). The package is built around a microkernel that contains basic routines for benchmarking tasks, such as accessing intermediate results in real-time ("spying" on run data), setting up simulated clients, defining scenarios, handling database calls, comparing results of different runs, summarizing data, etc.
For more information, visit http://openlc.sourceforge.net