PurgeCSS : PurgeCSS is a tool to remove unused CSS. It can be part of your development workflow.
Jaeger : Jaeger, inspired by Dapper and OpenZipkin, is a distributed tracing system released as open source by Uber Technologies. It is used for monitoring and...
UnCSS : UnCSS is a tool that removes unused CSS from your stylesheets. It works across multiple files and supports Javascript-injected CSS.
Compass : Compass is an open-source CSS Authoring Framework.
YAML Builder : A tool for visual layout development of YAML based CSS layouts
csscss will parse any CSS files you give it and let you know which rulesets have duplicated declarations.