PHP Shell is a shell wrapped in a PHP script. It's a tool you can use to execute arbiritary shell-commands or browse the filesystem on your remote Web server. This replaces, to a degree, a normal telnet-connection. You can use it for administration and maintenance of your Web site using commands like ps, free, du, df, and more.
Linuxlord is a client/server architecture to enable Web-based thin client computing using Linux. Linuxlord allows you to login to your Linux desktop from everywhere via a Java applet running in your Web browser. It supports compression, making it useful even over a dialup connection.
DataReel is a free, cross-platform database and communications toolkit. It can be used to rapidly develop and deploy multi-threaded database and communications applications. The DataReel toolkit is composed of a modular C++ library designed to build cross-platform infrastructures for end-user applications, embedded systems, and reusable libraries. DataReel's unique modular design simplifies adaptation, allowing you to determine the level of complexity. DataReel makes Internet connectivity and database programming easy.
DIET-PC (DIskless Embedded Technology Personal Computer) is a software kit enabling IT professionals to build embedded Linux appliances based on commodity PC or Mac hardware and various commercial embedded appliances. The focus is on platform portability, OS fundamentals and developer friendliness, rather than the end-user UI. The distribution is intended primarily for desktop graphical appliances, particularly thin clients (using the X11/XDMCP, ICA, RDP, and RFB graphics protocols). Although originally a network-booting OS, DIET-PC works well with various forms of solid-state persistent storage and hence is no longer strictly "diskless". The project uses QEMU virtual machines running Debian Linux (under Windows) as self-contained development environments, and hence may also be of interest for its unusual (non-x86) QEMU accomplishments.
Spinner is useful for keeping telnet and ssh links from dropping due to inactivity. Many firewalls and some ISPs drop connections when they are perceived as idle. By having spinner running, the server is constantly sent a tiny amount of data over the link, preserving the connection. Spinner thus acts as a keep-alive. It displays a little "spinning" ASCII character in the top left corner of your terminal. It supports any terminal capable of handling VT100-style escape codes. Spinner can also function transparently by only sending null characters to the terminal. In this mode Spinner supports any terminal. It also has a mode called "Ghost in the Machine" in which you can use Spinner to write the spinner character to any TTY, not just your own.