Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.
Glosbe - Huge collaborative massively multilingual dictionary.
Phrase - A platform offering AI-powered translation tools for localization at scale.
Visuwords - The fun and free way to look up definitions. THE graphical dictionary and visual thesaurus.
Crowdin - Localize your product in a seamless way
Wordnik - the biggest online English dictionary, by number of words