Denodo Platform
6.7#4 in data federation softwareFree planFree planWebAPILinuxSelf-hosted
VisitDenodo Platform is suited to enterprise teams connecting distributed data while applying shared definitions and governance. Its free Developer plan may be relevant to users seeking a no-cost entry point.
PGSpider may suit Linux users who want to query data across multiple sources through SQL and can build and self-host software. It is relevant to teams that need parallel queries or Multi-Tenant virtual tables.