xsysguard is a resource-friendly system monitor based on Imlib2. The main features include a powerful configuration file format, full alpha channel support, configurable widgets, and many data sources implemented as modules. For example, the daemon module allows you to monitor remote machines, and the file module can parse files with scanf or regular expressions.
Yet Another Flowmeter (YAF) is a tool for network flow capture, primarily designed to operate efficiently on white box hardware and generate IPFIX flow records. It is designed to operate primarily on Unix-based systems (including Mac OS X), and is supported by the Network Situational Awareness team at CERT.
SMTPUtils is a tool to secure mail servers, through testing or analysis, which provides the service manager or staff of computer security a summary of its implementation. It currently supports: resolution by MX record, checking for open relays, testing the perimeter antivirus system, testing the anti-spam system, performance testing, obtaining information, checking for DNSBL, SPF greylisting autodetection, and ping support.
xbaydns provides a Web management interface for BIND 9. Its user-friendly Web interface is based on the Django framework. It has been tested on many OSes, including FreeBSD, Linux, and MacOS X Leopard. It provides an easy-to-use Web interface for DNS record management while implementing most of the advanced features provided by BIND.
Image matting tool cuts out objects in photos using an alpha-matting technique. While clear cuts can be found for all objects that are clearly separated from their environment, objects with fuzzy borders and semi-transparent areas don't have a clear outline. The tool creates an alpha channel that defines the degree to which the background shines through the foreground for every pixel. The background color can then be subtracted. The user defines a rough boundary of an object with a large brush and a high-quality segmentation is generated. Problematic areas can be edited manually.