Craig: a bot for discord that lets you record audio conversations (not sneakily, publicly) for podcasts. It even splits everyone into separate audio files for easier edits.
Fantasia Archive: a program made for sorting DnD notes and worldbuilding, but helpful for writers too
Standard Notes: a free, secure note-taking app with powerful end-to-end encryption, unparalleled privacy features, and seamless cross-platform syncing on unlimited devices. (Added to the list by @[email protected] ))
Language Tool: Open-source spelling and grammar checker
FreeLearningList: several lists of websites where you can learn for free
TinyWow: A website with several different useful tools; such as converting file types, photo editing, and more.
Omni Calculator: This website has several different calculators/generators; including a solar setup calculator (tells you how many panels you need), constructions calculators (such as telling you how many sheets of drywall you will need) and more.
Food Swap Network: share homemade, homegrown, or foraged foods with each other.
Freegle: A free app for either giving away items you no longer want, or finding ones you need.
Dimensions: Need to know the average size of something? This website can show you the standard measurements and sizes of many different things.
Open-Sourced DIY prosthetic leg: “With an ever-increasing availability of new technologies, we created an affordable bionic leg that is accessible to everyone.”
DIY Open electric drive kit for wheelchairs - alpha v
“The present page is a follow-up project done by a group of 3rd year students from Electrical and Electronic Engineering at Imperial College where they built a first prototype of an electric wheelchair that will be the basis for future development of an open kit to build electric wheelchairs for cheap. The idea is to keep information open and make the system suitable to use off-the-shelf components.”
DIY Solar Powered WiFi Weather Station V3.0
"An Open Source Solar-Powered Weather Station to monitor Temperature, Humidity, Air Pressure, Wind Speed, Wind Direction, Rainfall, UV Index, and Lux Level”
Once something reaches a certain age, it can fall under public domain. This includes classical art (like the Mona Lisa).
If they are public domain, you can use them for commercial use or marketing.
Wikimedia Commons: check the copyright before using any images. There are some public domain, and some creative commons works.
Senso:
“Senso is a device that detects deforestation using sound analysis detecting machines used to cut down trees and warning the authorities”
Project Eel:
“Monitoring river water quality based on open-design multi-parameter sonde, built along with QuickFeather and SensiML service.”
Stream Research:
“Data is power, and with sufficient data we can approach our respective municipalities, and provide them with all the information they need to seek or allocate funding for the preservation and conservation of our natural waterways.”
Droncoria: Dronecoria develops Open Source biotechnological tools and knowledge. Enabling large-scale, low-cost environmental restorations through sowing drones and seed enhancement.