math and logic formula parser and evaluator
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Active Merchant is a simple payment abstraction library extracted from Shopify. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
Intelligent search made easy
AWS-S3 is a Ruby implementation of Amazon's S3 REST API
Database backed asynchronous priority queue -- Extracted from Shopify