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Visit the official Audacity website.

Audacity is a sound editing program which can record, playback, and mix sounds or apply effects using a variety of filters.

Audacity lets you edit your sounds using Cut, Copy and Paste (with unlimited Undo) and mix multiple tracks together. Save your files in a number of formats, including WAV, Ogg Vorbis and AIFF, or use Audacity’s native project format for high performance editing. It also has a built-in amplitude envelope editor, a customisable spectrogram mode and a frequency analysis window for audio analysis applications. Built-in effects include Bass Boost, Wahwah, and Noise Removal.

Use Audacity to record your own podcasts, mix music, or just be creative!

Visit the official Celestia website.

Celestia is a simulation of the entire universe, based on currently known astronomical information. It includes beautifully rendered planets, moons, and some smaller orbital bodies such as Mir and the International Space Station. Celestia is not limited to our solar system; you can visit other stars, or even travel outside the galaxy. You will find models of extra-solar planets in orbit around those stars for which we have evidence of planetary bodies. You have complete control over time and space, so you can view the stars from your chosen location and epoch. In addition, it is possible to create scripted presentations for complex demonstrations.

To get a good idea of Celestia’s full capabilities, start the program and press D for Demo.

Visit the official Really Slick Screensavers website.

The Really Slick Screensavers are a collection of impressive savers to prevent permanent monitor burn-in on your computer screen. Each saver is highly customisable to cater not only for personal taste but also to make the most of your particular computer.

Visit the official Stellarium website.

Stellarium is a planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. Just set your local co-ordinates (or choose to look at the sky from any other place or time on Earth!) and you’re treated to a natural and accurate view of the night’s sky.

Visit the official Sumatra PDF website.

Sumatra PDF is a flexible and lightweight PDF reader, with a minimalistic design that allows fast browsing and even faster loading times. It also remembers the last page of every PDF you read, so you can resume reading at any time in the future.

Visit the official VLC website.

The VLC media player supports numerous audio and video file-types out of the box, so you don’t have to download individual software to play most media files. You can also encode media to a variety of formats, and streaming support for audio and video over the internet/networks is also available.