Steem Developer Portal
Radiator - https://github.com/inertia186/radiator
Radiator is a Ruby API client to interact with the steem blockchain.
Steem-JS - https://github.com/steemit/steem-js
DSteem - https://github.com/jnordberg/dsteem
A Typescript Steem crypto library for node.js and browsers. Steemit Inc also maintains a version of this library
A python library to interact with the STEEM blockchain. It includes the CLI tool beempy.
PHP Steem - https://github.com/lukestokes/php-steem-tools
Various tools and scripts written in PHP for exploring the STEEM blockchain.
An API Wrapper for Steem written in Java
GoSteem - https://github.com/go-steem/rpc
Golang RPC client library for Steem
SteemClientRS - https://github.com/cyberpunk-ventures/steem-client-rs
Client library for Steem blockchain built with Rust