Dictionaries / Thesaurus

• OneLook: Multi Dictionary / Thesaurus Search
• Wiktionary: Dictionary
• Merriam-Webster: Dictionary / Thesaurus

• GoldenDict / 2 - Dictionary
• NGrams or Netspeak - Word Usage Trackers

• The Piracy Glossary: Piracy Dictionary

• UrbanDictionary or Slangit - Slang Word / Phrase Dictionaries

• Wordnik: Dictionary
• Oxford English Dictionary: Dictionary / Bypass
• Cambridge Dictionary: Dictionary
• PowerThesaurus: Thesaurus
• Historical Thesaurus of English: Historical Thesaurus
• Phrases.org: Phrase Dictionary
• Time Traveler: Find Words First Printed Usage
• EtymOnline: Etymologies
• Ozdic: Collocation Dictionary
• StarlingDB: Advanced Linguistics Dictionary
• Phrontistery: Obscure Word Dictionary
• Unionpedia, Lexipedia or VisuWords: Word Connections / Visualizers
• Eunoia: Words with No Translation
• Affixes.org: Affixes
• Fraze.it: Sentence Search
• Feeels: Emotion Synonym Chart
• PrideFlags: LGBT Flag Index
• TheDevilsDictionary: Cynical Dictionary
• WordSafety: Swear Word Indexes
• PyGlossary or DSL Converter: Convert Dictionary Files