Sites like cogsci.nl

PsychoPy: open-source Python software and documentation for building and running psychology and neuroscience experiments, with a graphical Builder and scripting

Personal blog and portfolio of Eevee, covering writing, drawing, games, toys and dev logs, with an explicit-content marker

MNE-Python, an open-source Python package for analyzing human neurophysiological data such as MEG and EEG

Existential Comics, a webcomic series of philosophy comics and dialogues about famous philosophers and their ideas

SciPy, an open source Python library of algorithms for scientific computing, covering optimization, integration, interpolation, statistics and differential equations

Compound Interest, a blog of chemistry infographics explaining everyday chemical compounds and recent chemistry news

Gephi, an open-source software project for visualizing and analysing network data through graph layouts, metrics and community detection

A personal blog by clinical psychologist Kristoffer Magnusson on R, statistics, psychotherapy, open science and data visualization

The MacPorts Project's official site offering a package manager for installing open-source software on macOS and other Unix-like systems

A web framework for building scalable web applications in Java and Scala, with documentation and source code on GitHub

Subclassed, a Mac and iOS app developer by Stefan Keller, making utilities that convert contacts and calendars

Skype a Scientist, a free program connecting classrooms with scientists by video call, with a blog and science art

Saturday Morning Breakfast Cereal, a webcomic by Zach Weinersmith featuring single-panel gags on science, philosophy and psychology

The Psychological Science Accelerator is a globally distributed research network pooling resources for large-scale psychology studies, with its website covering membership, news and history

CryptPad, an open-source end-to-end encrypted office suite for real-time collaborative documents, spreadsheets, slides and whiteboards, developed by XWiki SAS

NumPy project website: the official home of the open source Python library for numerical computing and N-dimensional arrays

Pocoo, a former team of open source developers behind Python projects Flask, Sphinx, Jinja, Werkzeug and Pygments

Stan, an open-source software project and documentation site for Bayesian statistical modeling and inference across several programming languages

Music Presence, a desktop app and project by Hannah that shows your Discord friends what music you are listening to

Personal site of economist Mauricio Vargas Sepúlveda, a PhD student, with blog posts on trade and R tools

Brattoo Propaganda Software, a company making Apple Photos utilities such as the Duplicate Annihilator duplicate-finder, plus free apps and support pages

conda-forge: a community-run GitHub organization of conda recipes, packages and the Miniforge installer for software distribution

WinScript is a tool for customizing Windows privacy, performance and apps settings through selectable tweaks, run from desktop or online

Invent with Python is a programming learning site with free books, tutorials and a blog by Al Sweigart

A JavaScript date and time picker component library called Vanilla Calendar Pro, with TypeScript support and no dependencies

A Python plotting library documentation site for Matplotlib, covering static, animated and interactive data visualizations

Mouseless, a desktop utility for controlling the mouse pointer with the keyboard, sold by Sonuscape

A searchable database of public-domain silhouette images of organisms for use in scientific and educational work, with a free API

PixiEditor, a free open-source pixel art, painting, vector and animation editor with a documentation section and forum

R CHARTS is a catalogue of R code examples for graphs and charts, by data scientist José Carlos Soage, with a colour reference

Green Tea Press, publisher of free programming, data science and modeling textbooks by Allen B. Downey

MeetingBar, a macOS menu bar app that shows calendar meetings and joins them with one click

A blog by statistician Gavin Simpson on R programming, permutation tests, generalized additive models and palaeoecology research

Kyle Walker's data science blog and consultancy site on GIS, census demographics, and spatial analysis in R