Moses is a statistical machine translation system that allows you to automatically train translation models for any language pair. All you need is a collection of translated texts (parallel corpus).
Transifex is a scalable localization platform with a focus on integrating with the existing workflow of both translators and developers. It aims to make it simple for content providers to receive quality translations from big translation communities, no matter where the project is hosted.
The Okapi Framework is a set of interface specifications, format definitions, components and applications that provides an environment to build interoperable tools for the different steps of the translation and localization process.