Yes, Grafana is an open-source tool. It is released under the terms of the Apache License 2.0, which is a permissive open-source license. This means that Grafana's source code is publicly available and can be freely used, modified, and distributed by anyone according to the terms of the license.
Being open-source has contributed to Grafana's popularity and widespread adoption. It has enabled a vibrant community of developers, contributors, and users to collaborate on improving and extending the tool's features, capabilities, and integrations. The open-source nature of Grafana encourages innovation, customization, and the creation of a wide range of plugins, extensions, and integrations that cater to various use cases and scenarios.