pymiproxy is a small, lightweight, man-in-the-middle embeddable proxy capable of performing HTTP and HTTPS (or SSL) inspection. The proxy provides a built-in certificate authority that is capable of generating certificates for SSL-based destinations. Pymiproxy is also extensible, and provides two methods for extending the proxy: method overloading and a pluggable interface. It is ideal for situations where you're in dire need of a proxy to tamper with out- and/or in-bound HTTP data.
Derrick is a simple tool for recording data streams of TCP and UDP traffic. It shares similarities with other network recorders, such as tcpflow and wireshark, though it is more advanced than the first and clearly inferior to the latter. It has been specifically designed to monitor application-layer communication. In contrast to other tools, the application data is logged in a line-based ASCII format. Common Unix tools, such as grep, sed, and awk, can be directly applied. Even replay of recorded communication is straightforward using netcat. Derrick supports on-the-fly compression and rotation of log files.
PumpKIN is a fully functional TFTP server and TFTP client that implements the TFTP protocol according to RFC1350. It also implements the block size option, which allows the transfer of files larger than 32MB, as well as transfer size and transfer timeout options described in RFC2348 and RFC2349.
The NSCA-ng package provides a client-server pair which makes the Nagios command pipe accessible to remote systems, with per-client passwords and fine-grained authorization control. This allows for submission of passive check results, downtimes, and many other commands to Nagios (or compatible monitoring solutions). Check results of arbitrary size and multiline plugin output are supported.