Cricket is a high performance, flexible system for monitoring trends in time-series data. It was developed to help network managers visualize and understand the traffic on their networks, but it can be used for all kinds of other jobs, as well. It features a hierarchical configuration system (which avoids duplicate info in the config files), full flexibility in RRD structure (arbitrary numbers of DS's and RRA's), a CGI-based graph-on-demand application, and SNMP- and EXEC-based data gathering.
DansGuardian is a Web content filtering proxy that uses Squid to do all the fetching. It filters using multiple methods including, but not limited to, phrase matching, file extension matching, MIME type matching, PICS filtering, and URL/domain blocking. It has the ability to switch off filtering by certain criteria including username, domain name, source IP, etc. The configurable logging produces a log in an easy to read format. It has the option to only log text-based pages, thus significantly reducing redundant information (such as every image on a page).
Diald manages network links, particularly on-demand links such as dial-up SLIP or PPP. It can also be used to manage and/or monitor any network interface. Diald monitors traffic on the link and makes intelligent (and highly configurable) decisions as to when the link should be brought up or taken down. The included control program, dctrl, runs on any system with Tcl/Tk (yes, even Windows) and allows diald to be controlled and monitored remotely.
Digicam is a simple and easy-to-use command-line utility to take, retrieve, and delete pictures from a Kodak DC21x camera. While the code is based on gphoto kodak_dc21x library, it fixes many annoying bug fixes in gphoto implementation, and allows for more options. Since digicam requires no user interaction and takes all the parameters from command line, it can be used in webcam-like scripts and for automatic image capture.