Crowdin - Localize your product in a seamless way

Amara - Amara

Applanga - Applanga is a flexible & easy to use cloud-based localization platform that automates the translation process for iOS, Android, OSX, Unity and web apps.

translated.by - It's called collaborative translation.

Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.

Aegisub - Aegisub is a free, cross-platform open source tool for creating and modifying subtitles. Aegisub makes it quick and easy to time subtitles to audio, and features many powerful tools for styling them, including a built-in real-time video preview.