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QuestDB is a high performance, open-source, time-series database

OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID…

QMQ是去哪儿网内部广泛使用的消息中间件，自2012年诞生以来在去哪儿网所有业务场景中广泛的应用，包括跟交易息息相关的订单场景； 也包括报价搜索等高吞吐量场景。

Pravega - Streaming as a new software defined storage primitive

Apache BookKeeper - a scalable, fault tolerant and low latency storage service optimized for append-only workloads

binary serialization format

Distributed Operations and Data Organizer built on Apache BookKeeper