netconf is a tool designed to replace Debian's ifupdown in a backwards-compatible manner while aiming for maximum extensibility and flexibility. While it can read existing interfaces files and execute hooks in much the same way, it ties in closer with aspects of network configuration that have become more and more important in the past decade: link and location autodetection, including a framework to configure printers, smarthosts, proxies, etc.; zeroconf; wireless LAN configuration; VPN; firewalling; advanced routing and traffic control; and more.
curl-loader is a powerful tool for testing and generating load for Web applications. It uses HTTP, FTP, and TLS/SSL stacks. The loader simulates tens and hundreds of thousands of users or clients, each optionally with its own IP address. The goal is to provide an alternative to the Spirent Avalanche and Ixia IxLoad Web application testing solutions.
UidSEC is an LSM (Linux Security Module) that extends the standard UN*X "resource protection" model by adding some features useful for untrusted multiuser systems. It can deny usage of dmesg to unprivileged users, hide processes of "other users" to unprivileged users, deny access to /sys and /config to unprivileged users, and protect usage of the bind() syscall using UidBIND.