Toolbox App is a control panel for your tools and projects.
If you use Ubuntu you might be using the Software Center to install .deb executable files. I recommend using GDebi, a dedicated program for installing Debian executable files. It is extremely lightweight and focused on installing .deb files. The best thing about GDebi is that it also shows the dependencies that will be installed along
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GNOME Terminal is a terminal emulation application that you can use to perform the following actions: Access a UNIX shell in the GNOME environment. Run any application that is designed to run on VT102, VT220, and xterm terminals. GNOME Terminal features the ability to use multiple terminals in a single window (tabs) and profiles support.
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Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms (Linux, Max OSX, Windows). Pencil is a good free Microsoft Visio alternative. Easy GUI Prototyping Built-in Shape Collections Diagram Drawing Support Exporting to Different Output Formats
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yEd is a powerful desktop application that can be used to quickly and effectively generate high-quality diagrams. Create diagrams manually, or import your external data for analysis. yEd is freely available and runs on all major platforms. yEd is a pure Java Swing application. It runs on all Windows, Unix/Linux, and Mac OS versions where
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