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MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

Cyberduck is a libre FTP, SFTP, WebDAV, Amazon S3, Backblaze B2, Microsoft Azure & OneDrive and OpenStack Swift file transfer client for Mac and Windows.

TranslatedEnterprise-grade Agentic RAG agent - full-pipeline coverage of document parsing, multi-channel retrieval, intent recognition, question rewriting, conversation memory, MCP tool calling, and deep thinking. Built for real business scenarios, a complete engineering implementation from 0 to 1.

Apache Linkis builds a computation middleware layer to facilitate connection, governance and orchestration between the upper applications and the underlying data engines.

An extremely easy way to perform background processing in Java. Backed by persistent storage. Open and free for commercial use.

SirixDB is an an embeddable, bitemporal, append-only database system and event store, storing immutable lightweight snapshots. It keeps the full history of each resource. Every commit stores a space-efficient snapshot through structural sharing. It is log-structured and never overwrites data. SirixDB uses a novel page-level versioning approach.

  • xquery
  • java
  • temporal-data
  • storage

An open-source columnar data format designed for fast & realtime analytic with big data.

  • indexr
  • columnar-storage
  • olap
  • datawarehouse

OME (Open Microscopy Environment) develops open-source software and data format standards for the storage and manipulation of biological light microscopy data. A joint project between universities, research establishments and industry in Europe and the USA, OME has over 20 active researchers with strong links to the microscopy community. Funded by private and public research grants, OME has been a major force on the international microscopy stage since 2000.

  • omero
  • java
  • python
  • server

The legacy distributed object storage server developed by PitchPoint Solutions can store billions of large and small files using minimal resources. Object data is stored in replicated volumes implemented like Facebooks Haystack Object Store. Object metadata which essentially maps an object name to a volume position is stored in an elasticsearch index. (Development by PitchPoint Solutions has been discontinued)