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Protocol Buffers - Google's data interchange format
CakePHP: The Rapid Development Framework for PHP - Official Repository
A Higher Order Component using react-redux to keep form state in a Redux store
The most awesome validation engine ever created for PHP
A lightweight library for converting complex objects to and from simple Python datatypes.
Language-agnostic HTTP API Testing Framework
Simple, lightweight model-based validation for Vue.js
Client Side Validation for AngularJS 1 - http://hueitan.github.io/angular-validation/
:monorail: "Scala on Rails" - A full-stack web app framework for rapid development in Scala
iOS framework for creating forms
SwiftCop is a validation library fully written in Swift and inspired by the clarity of Ruby On Rails Active Record validations.