Strictly spoken it's a piece of software, simulating the Solar System's bodies in 3D on your Windows or Linux PC (will work in most *NIX's as well). In difference to quite a few other programs it does so in realtime. Meaning you can view all the planets, moons and spaceships move along their paths, trace them, follow them, orbit them and even control them (time and spaceship contol). And you won't have to fight your way through hordes of green, slimey and one-eyed aliens for that ;-)
This page provides downloads of 32- and 64-bit Windows binaries of many open-source extension packages for the Python programming language. The files are unofficial (meaning: informal, unrecognized, personal, unsupported) and made available for testing and evaluation purposes only. Consider using the Python(x,y) or Enthought distributions if you are new to Python or need support. Most binaries are built from source code found in the projects public revision control systems. Source code changes, if any, have been submitted to the project maintainers or are included in the packages.
Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists. It grew out of a frustration that most task managers do not provide facilities for composite tasks. Often, tasks and other things todo consist of several activities. Task Coach is designed to deal with composite tasks. In addition, it offers effort tracking, categories, and notes. Task Coach is available for Windows, Mac OS X, Linux, and iPhone and iPod Touch.
If PDF is electronic paper, then pdftk is an electronic staple-remover, hole-punch, binder, secret-decoder-ring, and X-Ray-glasses. Pdftk is a simple tool for doing everyday things with PDF documents.