Building infrastructure on top of open source is important for the future. Open source allows modification of the product as time goes on. This is crucial for continued interoperation with other products. All source code/blueprints should come with royalty free rights, whether free or purchased. Building skillsets on open source is important for the future as well.
You can also search for freeware, although it often is not open source. Most shareware is time limited.
Here's a search engine that will allow you to search the top four code repositories. Search
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