lb is a very small and efficient libevent-based benchmarking tool for HTTP servers. It has been implemented with the main goal to provide a safe and quick replacement for the Apache 'ab' tool. Since its first release, it comes with the ability to benchmark several HTTP servers at the same time, theoretically limited only by operating system limits.
The 'ark' project is a libevent application development framework for fast development of asynchronous, libevent-based applications, including network clients and servers, but not restricted to them. It includes plugins support. The 'ark' framework does not like fork() and pthread_create() mainly because it believes that a single, full event-driven, non-blocking, well designed process is better able to do its job. A driver (single process) can control the jobs of multiple independent loadable plugins in the role of clients/servers/proxies.
'pksh' is a hack of the popular 'tcsh' for packets, bytes hosts, and protocols counts. It is a shell, a network sniffer, a query language for network monitoring, and finally a rendering engine to display in a form readable for humans and network administrators all traffic on LAN segments. It aims to give on character-based terminals the same level of information 'ntop' already provides via its embedded Web interface. It does not continuously fill the terminal with packet/byte/protocol information, but allows the user to perform his daily job at the shell level and take a look at network only via a set of commands implemented as extensions to native tcsh built-ins. Output can be filtered/sorted/paged/mailed/etc. using native Unix commands.