Tulip is an information visualization framework dedicated to the analysis and visualization of relational data. Tulip aims to provide the developer with a complete library, supporting the design of interactive information visualization applications for relational data that can be tailored to the problems he or she is addressing.
Comes with Python embedded to interact with the data.
Versions for multiple OSes are available. Might be worth grabbing the .appimage to save time.l
Ripcord is a desktop chat client for group-centric services like Slack and Discord. It provides a traditional compact desktop interface designed for power users. It's not built on top of web browser technology: it responds quickly to input, sips gently from computer resources, and gets out of your way. It does voice chat, too.
Number one feature: "Not made from a web browser."
eDEX-UI is a fullscreen desktop application resembling a sci-fi computer interface, heavily inspired from DEX-UI and the TRON Legacy movie effects. It runs the shell of your choice in a real terminal, and displays live information about your system. It was made to be used on large touchscreens but will work nicely on a regular desktop computer or perhaps a tablet PC or one of those funky 360° laptops with touchscreens.
Themeable. Uses Electron. If Electron will run on it, it'll work.
A personal file system indexing and search application. Part of the Gnome desktop. Indexes file contents, metadata, and location to better help you find things. Also allows you to do your own tagging of stuff it keeps track of. Uses D-BUS for IPC and SPARQL for search. Uses multiple ontologies for different kinds of files (including multimedia content).
Text mode window environment. A "retro" program for embedded or remote systems, that doubles as X11 terminal and text-mode equivalent of VNC server. It's a serious oversimplification, but think text-mode X, or maybe something like Desqview for DOS. Mouse support, window manager, terminal emulator and networked clients, all inside a text display.
Input takes its aesthetic cues from monospaced fonts and pixel fonts designed for consoles and screens, but casts off the technical limitations that constrained them. Designed to make programming easy on the eyes from the desktop. Generous spacing, large punctuation, and easily distinguishable characters. Multiple weights and widths.
Windows 95 in Electron. Runs on macOS, Linux, and Windows.
Another Jabber client for the Linux desktop. Gnome-aware but does not require Gnome. Supports multiple accounts.
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One of the earliest (and still maintained) F/OSS IM applications out there. Interfaces with most of the communication networks out there. Has a plugin architecture as well.
A lean and mean window manager for X.
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A SIP softphone for Linux.
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A list of all bootable Linux Live CDs, updated periodically.
Software that you can copy onto a USB key and run from any Windows system without having to actually install it.
How to debug removable devices under Linux with the Gnome desktop.
A command that can be used on a Linux machine if you're running Gnome to delete the oldest image and movie thumbnails in your desktop's cache to reclaim disk space. I run this command once a month as a cronjob.
An informative thread in the Ubuntu Forums about disabling the Recently Used and Recent Documents menus of the Gnome desktop for privacy. I used this method and it seems to work very well.
Free-as-in-beer antivirus and antimalware software for Windows. I've used it for a couple of years and I recommend it.