Transmission - Open Source BitTorrent Client

Transmission is an open source, volunteer-based project, and above all default BitTorrent client chosen by Ubuntu. Transmission allows users to download files from the Internet and upload their own files or torrents.

Vuze - Open Source BitTorrent Client

The Vuze Bittorrent Client is an open source end-to-end application for all your torrent needs. Although it is a complete bittorrent downloader, Vuze maintains a lightweight footprint, doesn't slow your computer down, and quickly downloads torrents.

SAGE

Open Source Mathematics Software

SAGE can be used for studying a wide variety of mathematics, including algebra, calculus, number theory, graph theory and more. It is used as an open source alternative to many commercial mathematics programs, including Magma, Maple, Mathematica and MATLAB.

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Maxima

Open Source Algebra Tool

Maxima is a popular computer algebra system that puts an emphasis on symbolic computation. It can be used for advanced algebraic calculations and will plot functions and data in both two and three dimensions.