On GitHub, I haven't come across any that handle multiple different types at once (Microdata, RDFa, JSON-LD). For JSON-LD though, I definitely can recommend Schema.NET if you deal with C# (full disclosure, I'm one of the two main collaborators on the project).
This being said, I actually launched a business the other day (no, literally the other day) called BrandVantage where I run an API which converts from multiple different types of structured (and unstructured data) to WebPage schema. brandvantage.co/ (There is a URL test on the homepage you can try).
It supports Microdata, RDFa, JSON-LD, Open Graph, Twitter Cards, meta tags and a few bits of unstructured data (with more enhancements coming).
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On GitHub, I haven't come across any that handle multiple different types at once (Microdata, RDFa, JSON-LD). For JSON-LD though, I definitely can recommend Schema.NET if you deal with C# (full disclosure, I'm one of the two main collaborators on the project).
This being said, I actually launched a business the other day (no, literally the other day) called BrandVantage where I run an API which converts from multiple different types of structured (and unstructured data) to WebPage schema. brandvantage.co/ (There is a URL test on the homepage you can try).
It supports Microdata, RDFa, JSON-LD, Open Graph, Twitter Cards, meta tags and a few bits of unstructured data (with more enhancements coming).