Free Software for Linux
Zim
Zim is a graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images. Pages are stored in a folder structure, like in an outliner, and can have attachments. Creating a new page is as easy as linking to a nonexistent page.
Openswan
Openswan has been a popular VPN alternative for Linux users since2005. It is an IPsec implementation with support for most of its extensions (RFC and IETF drafts), even IKEv2, NAT Traversal, X.509 Digital Certificates and more. Openswan comes packages with various Linux distributions, including Gentoo, Fedora, Ubuntu, Red Hat and others.
Avant Browser
Avant Browser is an ultra-fast web browser designed for the modern web. It provides a user-friendly interface that brings a new level of clarity and efficiency to your browsing experience, and frequent upgrades have steadily improved its reliability.
PostGraphile
PostGraphile (previously known as PostGraphQL) is a free an open-source software project that lets you spin up GraphQL APIs on top of an existing PostgreSQL database, instantly. PostGraphile automatically detects tables, columns, indexes, relationships, views, types, functions and comments in your database. Based on that information it generates a GraphQL server and API which is automatically updated when changes are made to the database or its data.
EiffelStudio
EiffelStudio is an Integrated Development Environment that enable you to produce correct, reliable, maintainable software and control the development process. The IDE is specifically designed for the Eiffel programming lanaguge and comes with a debugger and browsable editor that makes it easy to navigate parts of your system and track down bugs, and quickly fix them.
Apache Storm
Apache Storm makes it easy to reliably process unbounded streams of data for real-time processing. It is a distributed stream processing computation framework written predominantly in the programming language Clojure. The software is released free and open-source under the Apache License. In a nutshell, Apache Storm does to real-time processing, what Apache Hadoop did to bactch processing. Large corporations like Weather Channel, FullContact, Twitter, Yahoo, Spotify, and Alibaba use and trust Apache Storm for big data analytics with fault-tolerance and fast data processing.
Audacity
Audacity is an free and open-source, easy-to-use, multi-track audio editor and recorder for Windows, macOS, GNU/Linux and other operating systems. Audacity can record live audio through a microphone or mixer, or digitize recordings from other media. Import, edit, and combine sound files. Export your recordings in many different file formats, including multiple files at once. Audacity supports 16-bit, 24-bit and 32-bit. Sample rates and formats are converted using high-quality resampling and dithering. The easy and intetive workflow of Audacity supports editing with cut, copy, paste, delete and unlimited sequential undo/redo.
Replicant
Replicant is a fully free and open source Android distribution designed for freedom, privacy and security. Replicant replaces all proprietary Android components with free and open counterparts allowing you to be in control of your operating system, its software and your personal information and data.
SQuirreL SQL
SQuirreL SQL is a free and open-source SQL client and database administration tool. SQuirreL SQL is written in Java and uses JDBC to allow users to explore and interact with databases via a JDBC driver. With SQuirreL SQL you can manage your database through a graphical user interface where you can create and drop tables, add columns and rows, create function and query your data. The software is openly developed and released under the GNU Lesser General Public License which makes it free to use.