There are 4 repositories under marc21 topic.
The ArchivesSpace archives management tool
Integrated Library System / 图书馆集成系统
QA catalogue – a metadata quality assessment tool for library catalogue records (MARC, PICA)
Simple interface for working with MARC records using the File_MARC package
BookOps WorldCat Metadata API wrapper
🗂️ A Rails application for the inventory of handwritten and printed music scores
新一代分布式图书馆软件
Command line script for converting Marc21 Classification and Authority records to SKOS/RDF
Kurs "Bibliotheks- und Archivinformatik" im Studiengang Information Science der FH Graubünden
A Python module and CLI tool that transforms legacy ILS data into the native FOLIO formats and loads it into FOLIO
Calibre Plugin to download metadata and covers from DNB (Deutsche Nationalbibliothek)
Takes an OAI-PMH set feed from The Open Archives Initiative, converts the Dublin Core data to MARC21, and saves the output to the local machine for import into Alma, OCLC Connexion, MARCEdit, etc.
Script for editing or removing subject fields (648/650/651/655) in bibliographic records in Alma
Web service that allows item fetching through Z39.50 server, transformation of Unimarc to Marc21 and upload to Koha repository through Koha-API
** DEPRECATED: Closed ** FOLIO metadata management / marccat module
A parser for the Marc format for bibliographic data.
Python module for making requests to the ExLibris Alma API
Creating a FAIR Linked Data corpus for the BELTRANS research project about Belgian book translations NL-FR and FR-NL between 1970 and 2020
A context-sensitive ISBD parser.
a Python3 program that searches a single MARC record via a given id (controlfield 001) in a given (binary) MARC records file and writes it into a single (binary) MARC file
A python library for allowing programmers to build applications for searching and exploring the MARC schema
code for converting MARC data to Wikidata statements using OpenRefine