hprobe is a packet generator with a built-in sniffer (using libpcap). It can generate many types of network probes to scan hosts and networks and automatically analyses the responses.
Written in C for Linux platform
AuthClassed is a class, written in PHP, to implement a simple authentification scheme for database-oriented webpages. Using AuthClassed is as simple as putting a single code line at the top of the webpage you would like to protect.