Visual, extensible graph platform for OSINT link-analysis/investigations (Maltego-style); ~7.5k stars; dual-use OSINT tool
Yes, flowsint is open source under the Apache-2.0 license.
flowsint is free to use.
Yes, flowsint can be self-hosted (the source is available under the Apache-2.0 license).
Visual, extensible graph platform for OSINT link-analysis/investigations (Maltego-style); ~7.5k stars; dual-use OSINT tool