Below is the list of Open Source Libraries for the OID4VC specifications.

OpenID for Verifiable Credential Issuance (OID4VCI)

• Wallet (Client) 
  – https://github.com/walt-id/waltid-ssikit : supports EBSI/ESSIF related Use Cases

• Issuer (Authorization Server/Resource Server)
  – https://github.com/spruceid/oidc4vci-rs 
  – https://github.com/spruceid/oidc4vci-issuer

• Both Wallet and Issuer 
  – https://github.com/Sphereon-Opensource/OpenID4VCI
  
  

OpenID for Verifiable Presentations (OID4VP)

• Wallet (Authorization Server)
  – https://github.com/walt-id/waltid-ssikit : supports EBSI/ESSIF related Use Cases
  – https://github.com/Sphereon-Opensource/ssi-sdk : SDK based on the work done by Veramo
  – https://github.com/microsoft/VerifiableCredential-SDK-Android
  – https://github.com/microsoft/VerifiableCredential-SDK-iOS

• Verifier (Client)
• Both Wallet and Verifier
  – https://github.com/Sphereon-Opensource/SIOP-OpenID4VP
  
  

Self-Issued OpenID Provider v2 (SIOPv2)

• Wallet (Authorization Server) – https://github.com/walt-id/waltid-ssikit : supports EBSI/ESSIF related Use Cases
  –  https://github.com/Sphereon-Opensource/ssi-sdk : SDK based on the work done by Veramo 
  – https://github.com/microsoft/VerifiableCredential-SDK-Android
  – https://github.com/microsoft/VerifiableCredential-SDK-iOS

• Verifier (Relying Party)
• Both Wallet and Verifier !- https://github.com/Sphereon-Opensource/SIOP-OpenID4VP