HelpCenter.io - Empower your customers for self-service and lower your customer support costs with a customer-centric and smart knowledge base.
Crowdin - Localize your product in a seamless way
Support Hero - Educate your customers through self-help support
POEditor - The translation and localization management platform that's easy to use *and* affordable!
phpMyFAQ - phpMyFAQ is a world’s most popular mobile-friendly, feature-rich and open-sources FAQ software that uses PHP 5.
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.