Writefull Thesaurus - A Google Docs add-on that uses AI to give you synonyms
Google Open Source - All of Googles open source projects under a single umbrella
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
Opensource Builders - Find open-source alternatives to commercial apps
Reverse Dictionary - Describe a concept and get back a list of words
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.