Chronos is a Web agenda calendar for intranets, although it can be used from anywhere. It can send reminders by email, and it allows you to schedule multi-user events. It is fast and light on resources. The balance between size and speed can be tweaked by tweaking mod_perl and Apache.
YahooPOPs! is an application which emulates a POP3 mail server and provides free POP3 access to Yahoo! It does not depend on Yahoo's POP3 mail server. You can use a POP3 mail client of your choice. This application emulates a POP3 server and enables popular email clients like Outlook, Netscape, Eudora, Mozilla, and Calypso to download email from Yahoo! accounts.
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.
Automatos provides tools for automated performance analysis, capacity planning, and real-time monitoring of services across multiple platforms (Linux, NT/2000/XP, AIX, Solaris, Tru64, and HP-UX). The performance analysis service assists in identification or prevention of problems with computers within a company's network. The capacity wizard provides hardware upgrade planning support, suggestions being based on current (or simulated) growth rate. Real-time monitoring allows users to remotely monitor their machines from either a Web or a WAP console, generating notifications based on user-defined thresholds. Automatos is a low-intrusion system that uses strong encryption and compresses data for optimal and minimum bandwidth usage. Reports are generated in PDF format in several different languages. Ad-hoc online report generation and customization is also available.