updyn is a shell script that updates a dynamic DNS service with the current IP address. It will work with any dynamic DNS service that allows you to call a URL to update the DNS. It works behind a router when an external IP address is different from internal IP, optional minimum time check, does not update unless your actual IP is different from your assigned IP, and can be set to update the DNS every set number of days whether or not your IP has changed.
uperf is a network performance tool that supports modelling and replay of various networking patterns. It represents the next generation benchmarking tools (like filebench) where instead of running a fixed benchmark or workload, a description (or model) of the workload is provided and the tool generates the load according to the model. By distilling the benchmark or workload into a model, you can do various things like change the scale of the workload, change different parameters, change protocols, etc and analyse the effect of these changes on your model. You can also study the effect of interleaving CPU activity, or think times or the use of SSL instead of TCP, among many other things.
upnp2mrtg is a simple add-on for the MRTG (Multi Router Traffic Grapher). It can be used to monitor incoming and outgoing bytes of the external interface of the FritzBox DSL router. upnp2mrtg is a command line tool to gather statistics from an upnp enabled FritzBox DSL router. It is a lightweight shell-script for use with MRTG, so no underlying external software (with the exception of netcat) or libraries are required. Using bash-networking instead of netcat is also supported.
upsguru is a daemon that monitors a UPS connected to a serial port. It has been extensively tested with a rebadged Centralion UPS. It communicates with init via the /dev/ initctl FIFO in order to control system services in the event of a power failure. The sample scripts include commands for SMS notification using gnokii. Protocol details are also contained in the archive.
usb4java is a Java library for accessing USB devices. It is based on the native libusb 1.0 library and uses Java NIO buffers for data exchange between libusb and Java. It also supports the javax-usb standard (JSR-80) through the usb4java-javax extension. Supported platforms are Linux (x86 32/64-bit, ARM 32-bit), OS X (x86 32/64-bit), and Windows (x86 32/64-bit). Other platforms may work as well (as long as they have at least Java 6 and are supported by libusb) by compiling the JNI library manually.