User-Mode Linux lets you run Linux inside Linux. It is a safe, secure way of running Linux versions and Linux processes. Run buggy software, experiment with new Linux kernels or distributions, and poke around in the internals of Linux, all without risking your main Linux setup. User-Mode Linux gives you a virtual machine that may have more hardware and software virtual resources than your actual, physical computer. You can assign your virtual machine only the hardware access you want it to have. With properly limited access, nothing you do on the virtual machine can change or damage your real computer or its software.
kchuid is an experimental Linux kernel module that allows you to change the UID/GID/CAPS of a running process (by PID). Think of it as providing a setuid() system call that also has a pid_t argument. It's the first step in a full authentication system, and further, a full Unixish system devoid of setuid binaries/scripts.
The Cap Processor Usage patch (or CPU patch for short) is a modification to the Linux kernel that allows you to limit the amount of CPU power any given task can get. Unlike the ulimit command, it does not limit total time a task can run. Instead it limits the percentage of the CPU's time that the task can get. It also differs from the nice command, as it does not change the priority of the task.
Firewall is a set of scripts (firewall, fwup, and fwdown) that implement an ipchains firewall and various forms of network address and port translation. All you have to do is read the policy file and edit it to reflect your topology and filtering policy. It supports many different types of network topology (single host, traditional forwarding, masquerading, port forwarding, alias port forwarding and NAT), up to 10 untrusted interfaces each with their own policy, and over 50 network applications. It also supports centralised administration of multiple remote firewalls (meta-firewall).
Sirid is a Web-based tool for managing software projects. The main features of Sirid are assigning tasks between the personnel, reporting bugs, managing specifications, and recording feature requests. The program also sends notifications of new bugs and tasks to people who have been set responsible for them, and notifies the responsible people when the deadline of some bug or task is approaching. It features graphical presentations for tracking the progress of your project. Sirid keeps you informed of the status of each of your projects, and allows you to take action if difficulties arise.