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WordPress
WordPress, Git-ified. This repository is just a mirror of the WordPress subversion repository. Please do not send pull requests. Submit pull requests to https://github.com/WordPress/wordpress-develop and patches to https://core.trac.wordpress.org/ instead.
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n8n
Free and source-available fair-code licensed workflow automation tool. Easily automate tasks across different services.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
A well-known example is Automattic, the parent company that maintains and distributes WordPress.org. While Automattic now runs several closed source software products in addition to the open source WordPress, they started primarily as an open source business.
Some open source projects allow you to run their software on your own servers for free, but they’ll charge you for a hosted version. For example, you can deploy n8n.io to an AWS or DigitalOcean machine and keep it running on your own, or you can sign up for their hosted version and avoid the hassle of maintaining servers.