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The Translate Toolkit is designed by localisers for localisers. Its aim is to make localisation easier and of higher quality. The toolkit can convert between various different translation formats and makes it possible to stay in one format across all localisation tasks.
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.
Project Open is a general-purpose project management system with a translation module. The source license is a GPL hybrid, and the translation module is FL (“Free License”), which is “pseudo FOSS”, with extensive limits on redistribution of code.
Virtaal is a graphical translation tool. It is meant to be easy to use and powerful at the same time. Although the initial focus is on software translation (localisation or l10n), it is definitely useful for other forms of translation.