matomo-org/matomo-sdk-android

Grafana is grafana/grafana on GitHub, an open-source project listed by GitHub as primarily TypeScript. It's licensed AGPL-3.0-only, with the repository noting Apache-2.0 exceptions documented separately in LICENSING.md. The project centers on turning metrics, logs, and traces from many backends into shared dashboards, alerts, and ad-hoc exploration views rather than storing that data itself.

mall is a Java e-commerce reference project from developer macrozheng, pairing a customer storefront with a separate admin backend on one Spring Boot and MyBatis codebase. The README describes a modular layout, mall-admin, mall-portal, mall-search, mall-security, mall-mbg, and mall-common, plus a supporting stack of Elasticsearch, RabbitMQ, Redis, and MongoDB, deployed through Docker. A sister project, mall-swarm, offers a Spring Cloud Alibaba microservices version of the same system.

Doocs Advanced Java (doocs/advanced-java) is a mostly Chinese-language collection of long-form Q&A documents on Java backend interview topics: message queues, Elasticsearch, Redis, database sharding, Dubbo, Zookeeper, Hystrix, and Spring Cloud microservices. Most of the writing traces back to one instructor, credited in the README as 中华石杉, organized by the Doocs community into linked markdown files. It is hosted on GitHub and is licensed CC-BY-SA-4.0.

Elasticsearch is an open-source distributed search and analytics engine maintained at elastic/elasticsearch. Written in Java, it's described as the foundation of Elastic's Stack platform, combining full-text search, vector search, and a scalable data store in one system. The repository's GitHub metadata doesn't state a single clear license here, and the README excerpt doesn't spell one out either.