There are 6 repositories under fhir-validator topic.
A standalone app for validating FHIR resources against an optional Implementation Guide
Node.js version FHIR validator using node-java connect to FHIR's java APIs
An open-source Django based FHIR server
fhir-marshal is a lightweight service for FHIR Resource Validation with profile allowlisting and terminology server connection.
This is an Inferno test kit by HL7 FHIR At Scale Taskforce (FAST) for digital identity and patient matching implementation guide. It launches a dockerized application that can query a locally running server and report conformance to the FHIR implementation guide specifications.