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Really good site for creating animated gifs from videos and lots lots more.
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ruby – Is a global variable defined inside a Sinatra route shared between requests? – Stack Overflow
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How to build Sinatra apps with background processing
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Sinatra state management tips
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Sinatra/Heroku microservices | silk and spinach
How to build microservices on Heroku with Sinatra. Realy useful!
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GitHub Developer Pack Offer | Heroku
Heroku and Github free offers