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swagger-ui
Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.
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free-for-dev
A list of SaaS, PaaS and IaaS offerings that have free tiers of interest to devops and infradev
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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.
It makes sense for pretty much every service to add public APIs and allow others to integrate. It opens up new use-cases and revenue streams, and for the most part we already have these APIs. OpenAPI makes it pretty easy to define the APIs, and then generate the web interfaces in your language, generate documentation, generate mocks, generate tests, etc... All those generated stuff is super important: Developers will need the documentation to use your API and do the integrations. Mocks will allow them to test the integration without loading your production application. Generated tests will let you continuously validate that you didn't break the APIs (since other developers will rely on their for their applications, it is critical not to break their applications - they won't come back and tell their friends). https://swagger.io/ has great tools for OpenAPI.
Using free API's sometimes has it's drawbacks. I built a product on faunaDB because it's serverless/scalable etc but it's extremely difficult to use since they use their "special" query language and the database availability is quite poor. I switched to MongoDB atlas and it's been good so far. Also, there's cockroachDB, and a whole lot of free tools here https://github.com/ripienaar/free-for-dev