As promised back in June, Apple just open-sourced the Swift programming language that developers use to build apps for Macs and iOS devices. While this might not mean much for regular folks who use those apps, for developers, it’s a huge step forward.

Apple is known for creating walled gardens, and that includes the code used to create apps for its ecosystem. Before last year’s rollout of Swift, the company used Objective-C, which was completely closed off—developers couldn’t modify the language at all. That’s not exactly detrimental—apps like LinkedIn, Yahoo Weather, and Clear have switched entirely to Swift for their iOS apps.

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