IPv6 analysis tool, with the particularity that their attacks can't be detected by Snort
HammerDB is an open source database load testing and benchmarking tool for Oracle, SQL Server, TimesTen, PostgreSQL, Greenplum, Postgres Plus Advanced Server, MySQL and Redis
clumsy makes your network condition on Windows significantly worse, but in a managed and interactive manner.
Very good Windows application debugger engine written in Python.
LiMe is Loadable Kernel Module, which allows the acquisition of volatile memory.
Practical instrumentation-driven fuzzer for binary fileformats.