CrateDB (February 2020)
By: Philip Howard
Free Download (subject to terms)
CrateDB is targeted specifically at IoT applications and ingesting and processing machine data and it can be deployed both at the edge and more centrally. However, the database is not ACID compliant (it offers eventual consistency) so will be suitable for hybrid environments support real-time operational and analytic processing, but not transactional (in the traditional sense of that term) processing.