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You can use directly Matomo (formerly Piwik)'s codebase to call the reporting API. Learn more in Querying the reporting API.
A Ruby client for the reporting API is available on Github: github.com/matomo-org/matomo-ruby-api.
A complete Python client implementation of the reporting API is available on Github at github.com/matomo-org/matomo-python-api.
A C# client implementation of the reporting API is available on Github at github.com/matomo-org/matomo-dotnet-api.
A NodeJS client is available on Github at github.com/sandfox/nodejs-piwik.
A client library for Laravel (a PHP framework) is available at github.com/RobBrazier/Laravel_Piwik.
If you're looking instead for client libraries to use Matomo Tracking HTTP API and track your application or API usage, please see our Matomo Tracking API Clients guide.
You can view the complete list of clients and integrations of Matomo at matomo.org/integrate/.