Pencil: GUI prototyping

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 Graph Editor

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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Install Adobe Acrobat Reader on Ubuntu

Please note that Adobe no longer supports Acrobat Reader for Linux. The latest native Linux version is 9.5.5 dated from 26/04/2013. From this reason you should refrain using/installing Adobe Acrobat Reader if possible to avoid potential vulnerabilities and hacker exploits. apt install libxml2:i386 gdebi-core wget ftp://ftp.adobe.com/pub/adobe/reader/unix/9.x/9.5.5/enu/AdbeRdr9.5.5-1_i386linux_enu.deb sudo gdebi AdbeRdr9.5.5-1_i386linux_enu.deb   # If there is a
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PulseAudio Equalizer

The Pulse Audio equalizer gives you the opportunity to set up and enable a system-wide equalizer in order to help you tune all of the sounds in a certain preset. If you’re using Ubuntu, you can install this utility through a third party repository. Enter the following commands to do so: sudo add-apt-repository ppa:nilarimogard/webupd8 sudo
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