Let's be honest: Linux is harder to master than Windows. Sometimes it's not user-friendly, and following an outdated tutorial may break your Raspberry Pi's operating system. There is no centralized software repository, except for the apt repositories which severely lack many desktop applications. Surely there is a better way! There is. Introducing Pi-Apps, an expanding, well-maintained collection of app installation-scripts that you can run with one click.
Desktop application that, when installed, presents a list of categories of applications to install. Pick, click, and go.
Magicmirror is a software package for, well, making one of those nifty RaspberryPi magic mirrors that people seem to like building for their houses. Modular; turn on the bits you want, turn off the bits you don't.
Of course, the damned thing uses Electron.
Open source machine learning and data visualization for novice and expert. Interactive data analysis workflows with a large toolbox. Perform simple data analysis with clever data visualization. Explore statistical distributions, box plots and scatter plots, or dive deeper with decision trees, hierarchical clustering, heatmaps, MDS and linear projections. Interactive data exploration. Add-ons available.
Source code for the Gotify Android client application. Can also be installed from the Play or F-Droid stores.
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.
Blokada is an ad and surveillance blocker for Android. Sets up a virtual VPN connection (so it doesn't need root) and filters all outbound connection requests. Works at the OS level so you don't have to plug it into a bunch of your apps.
Github: https://github.com/blokadaorg/blokada
F-Droid: https://f-droid.org/packages/org.blokada.alarm/
An introduction to the Flask web framework for Python. Also describes how to turn it into a "real" installed project with setup.py.
Somebody's re-implementing Hypercard as a web application. It's on Github. Repo here: https://github.com/downpoured/vipercard
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 daemon that runs on a *nix machine that simulates a network of other systems (of many different operating systems) for the purposes of catching and monitoring intruders.
textfiles.com now offers the contents of entire BBS file and shareware CD-ROMs for download. Some of these are quite famous.
A complete wiki distributed as a single self-modifying HTML file. Dripping with Javascript options and tools. You don't need a web server or a database, just a relatively recent web browser and someplace to store the file. Can be freely shared on a web