How to design better APIs

 https://r.bluethl.net/how-to-design-better-apis

Good, basic information I wish more people followed. 

Welcome to KOR Connect Give your frontend infinite power through APIs

https://korconnect.io/ 

interesting unified layer for front-end development that handles authentication, etc. 

Everything You Ever Wanted to Know About WebRTC

 https://blog.openreplay.com/everything-you-ever-wanted-to-know-about-webrtc

New quasi-serverless browser communication APIs. 

35+ Free Public APIs to Improve Productivity

 https://blog.idrisolubisi.com/35-free-public-apis-to-improve-productivity

Not sure how much some of these actually boost productivity, but they're fun anyway. 

7 Free APIs That Nobody Is Talking About

 https://medium.com/javascript-in-plain-english/7-free-apis-that-nobody-is-talking-about-cf974e15917

Some fun ones here

Test your front-end against a real API

https://reqres.in/
Free API that allows you to learn to make requests

10 Intriguing Public REST APIs For Your Next Project

https://dev.to/camerenisonfire/10-intriguing-public-rest-apis-for-your-next-project-2gbd
interesting easy APIs

API Connector lets you access data from thousands of platforms directly within Google Sheets. No coding required!

https://mixedanalytics.com/api-connector/
Interesting, instead of making google sheets an API server, it makes Google Sheets and API client. 

Design patterns for modern web APIs

https://blog.feathersjs.com/design-patterns-for-modern-web-apis-1f046635215
Not sure they're exactly design pattern, more like best practices.

RESTful API Design — Step By Step Guide

https://medium.com/better-programming/restful-api-design-step-by-step-guide-2f2c9f9fcdbf
pretty good starter rules: nouns, not verbs; singular not plural; right methods; right response codes; etc.

Space Cloud β : Instant Realtime APIs on Any Database

https://spaceuptech.com/
Interesting opensource project to give access to databases via APIs

JSON API, OpenAPI and JSON Schema Working in Harmony

https://blog.apisyouwonthate.com/json-api-openapi-and-json-schema-working-in-harmony-ad4175f4ff84

Various shades of JSON API standards

How to Breakthrough the Old Monolith Using the Strangler Pattern

https://dev.to/kylegalbraith/how-to-breakthrough-the-old-monolith-using-the-strangler-pattern-63e
Interesting way to break up a monolithic codebase.

Stop Calling Your APIs Microservices

https://blog.stoplight.io/stop-calling-your-apis-microservices-e165a80eba9d
Not quite sure I agree with his interpretations.