Modern javascript i18n localization library based on ES6 tagged templates and the good old GNU gettext. Just tag your strings to make them translatable. Use a simple ttag-cli tool for translation extraction. Can be easily integrated with almost any workflow as it uses the babel-plugin for string extraction. Can be easily used with the typescript. Allows you to place translations into the sources on a build step. Gettext is a simple localization format with a rich ecosystem.
mfx2 (Metabolic Framework Foundation) is a fundamental class library to make your own framework quickly. This is especially designed to develop a large or complicated Flash web project which needs a its exclusive framework.