Below are the most popular platforms for Smart TV. The full list is here.

Official resources

• Samsung TV Developers site - News, documentation and SDK downloads.
• Tizen TV Developers site - Full API documentation and guides for developing Tizen TV apps.
• Tizen Studio - IDE for TV apps development including Tizen TV Emulator.
• Smart View SDK - Official Android, IOS and JavaScript SDK for communication between remote device and Samsung Smart TV.
• Samsung TV Developers Forum - Ask questions and share tips when developing apps with Samsung SDKs.
• Samsung Smart TV Bug Bounty - If you find bug in Samsung TV, submit it here and get a reward $1000+.
• vscode-extension-tizentv - A Visual Studio Code extension that provides a lightweight IDE for Tizen application developers.
• Wits - A tool for reloading tv app's JavaScript/CSS without reinstalling the app every time you make a change.

Third-party remote control libraries

• samsungctl - Library and command line tool for remote controlling Samsung televisions via a TCP/IP connection. It currently supports both pre-2016 TVs as well most of the modern Tizen-OS TVs with Ethernet or Wi-Fi connectivity (Python).
• samsung-tv-remote - Node.js module to remotely control Samsung Smart TV starting from 2016 (JavaScript).
• homebridge-samsungtv2016 - A plugin for Homebridge that allows you to control your 2016 Samsung TV with HomeKit and Siri (JavaScript).
• homebridge-samsung-tizen - A plugin for Homebridge that allows you to control your Samsung Tizen TV with HomeKit and Siri (JavaScript).
• samsung-remote-models-2014-and-newer - Encrypted communication with the internal web service of Samsung TV models 2014+.
• SmartCrypto - SmartView2 encrypted handshake API implementation in C/Python.
• samsung-messagebox - Python script to show notifications on Samsung TVs.
• samsung-tv-control - Library for remote control Samsung TV in your Node.js

Other

• Identification of Samsung TV models 2008-2017 - How to get screen size, matrix type, year of development, series and other parameters from Samsung TV model name.
• Tizen Studio development references - Documents focused on web apps for Smart TVs e Professional Monitors, based in personal researches.
• [TizenBrew] (https://github.com/reisxd/TizenBrew) - A way to experience modded websites and you can install newer apps without fighting with Tizen Studio
• [TizenTube] (https://github.com/reisxd/TizenTube) - A TizenBrew module that enhances your favourite streaming websites viewing experience by removing ads and adding support for Sponsorblock.
• Beam-TV - Open-source, no-account media player for Samsung Tizen TVs. Plays USB and local-network (DLNA) video/audio/subtitles directly on the TV (JavaScript).

Official resources

• webOS TV Developers Site - WebOS TV apps development principles, tutorials, API documentation and packaging tools.
• webOS TV IDE + SDK - IDE for apps development including a Command Line Interface and emulator.
• Connect SDK - Open source framework developed by LG that connects your mobile apps with multiple media device platforms. Currently supports 8 platforms. But seems abandoned.
• webOS TV Developers Forum - Ask questions, share information and learn about Smart TV app development with other developers.

Third-party remote control libraries

• lgtv2 - Node.js module for remote control of LG webOS TV via WebSocket messages (JavaScript).
• node-red-contrib-lgtv - Module for Node-RED allowing remote control of LG webOS Smart TVs (JavaScript).
• node-webos - Node.js module to discover and control webOS TVs (JavaScript).
• lgtv2mqtt - Interface between LG WebOS Smart TVs and MQTT (JavaScript).
• ares-webos-sdk - webOS CLI as separate NPM module (JavaScript).
• pylgtv - Library to control webOS based LG Tv devices (Python).
• LGWebOSRemote - Command line tool for webOS remote control of LG TVs (Python).
• homebridge-webos-tv - A plugin for Homebridge which allows you to control your webOS TV.
• PyWebOSTV - A generic & entensible WebOS 3.0 Client Library (Python2, Python3).
• go-webos - A small Go library for interaction with webOS TVs (golang).

Videos

• LG Magic Motion Remote - Point, Click, and Control - Operate TV like a computer mouse.

Other

• openlgtv.org.ru - A non-commercial project for legal reverse engineering and research on LG Television firmware. Seems a bit outdated but contains a lot of information.
• Identification of LG TV models 2011-2017 - How to get screen size, matrix type, year of development, series and ohter parameters from LG TV model name.

Official resources

• Android TV Developers site - Documentation, tutorials and best practises for building Android TV apps.

Articles

• How to develop Android TV App? - An article about developing apps for Android TV.

Official resources

• tvOS Developers Site - SDK, documentation and tutorials for developing tvOS apps.
• TVML - Apple TV Markup Language for creating tvOS apps.

Official resources

• Google Cast SDK - Official Google Cast SDK documentation and tutorials.
• TVs with Chromecast built-in - List of vendors supporting built-in Chromecast and advantages over traditional TV remote controller.

• react-tv - React development for TV: renderer for low memory applications and Packager for WebOS, Tizen, Orsay.
• TOAST - Samsung open-source framework for multi-platform TV apps developemnt.
• Enyo - LG framework for development apps for all major platforms, from phones and tablets to PCs and TVs.
• Smartbox - Smart TV universal library for Samsung, LG, Philips, SmartTV Aliance, STB Mag app development.
• Mautilus Smart TV SDK - A platform-agnostic framework for developing TV Apps. Supports Samsung, LG, Philips, Sony, Panasonic and VESTEL Smart TVs.
• BBC TAL - An open source library for building applications for Smart TV developed by BBC engineers.
• PureQML TV - A declarative front-end framework for web-based SmartTV/STB platforms. Has experimental support of Android TV.
• ZombieBox - An open source Smart TV framework. Strongly typed JavaScript, component based, built-in D-PAD navigation management, abstract video API with DRM for all platforms. Supports many platforms like Tizen, webOS, Android TV, etc.

• DLNA - Industry-wide standard for sharing data over a home network. Depending on the DLNA-compatible devices you own, you might be able to stream films from your laptop to your TV, play an MP3 stored on your phone over your hi-fi system, or print a photo from your tablet on your home printer.
• DIAL - Developed by Netflix and Google, this protocol alows client devices (like smartphone, tablet, or computer) to discover apps on server devices (like a smart TV or streaming box) and launch content on them.
• Wi-Fi Direct - Standard enabling devices to easily connect with each other without requiring a wireless access point.
• Miracast - Standard for wireless connections from devices (such as laptops, tablets, or smartphones) to displays (such as TVs, monitors or projectors). Works over Wi-Fi Direct.

• smartest-tv - CLI and MCP server for playing Netflix, YouTube, and Spotify on any smart TV by name. Deep links content across LG, Samsung, Android TV, and Roku — say "Frieren S2E8" and it plays (Python).
• Fluxcast - A user-friendly Python utility for mirroring Linux desktops to Smart TVs via Miracast and DLNA, supporting GNOME, KDE, and wlroots/Wayland.

• lrud - Left, Right, Up, Down. A spatial navigation library for devices with input via directional controls.
• js-spatial-navigation - A javascript-based implementation of Spatial Navigation.
• react-js-spatial-navigation - A wrapper of js-spatial-navigation to react components.
• react-key-navigation - Spatial Navigation components for React. Similar to the "Focus Management" of the BBC TAL.
• react-spatial-navigation - HOC-based Spatial Navigation (key navigation) solution for React.

• Suitest - Test automation solution for Smart TVs, gaming consoles, streaming sticks etc.
• stb-tester - Automated User Interface Testing for Set-Top Boxes & Smart TVs (python).

• LIRC - A package that allows you to decode and send infra-red signals of many (but not all) commonly used remote controls.
• awesome-smarttv - Another list of Smart TV resources. Discovered after this one was already done :roll_eyes:.
• docker-tizen-webos-sdk - Docker image with Samsung Tizen CLI and LG webOS CLI. Allows to develop, build, launch and debug Smart TV apps without installing Tizen Studio and webOS SDK.

• Stack Overflow
• Reddit