D2RMM
A widely used mod manager for Diablo II: Resurrected that helps install and combine multiple D2R mods.
Reviewed Unknown
CASC archive viewer for Blizzard games, useful for Diablo II: Resurrected file extraction, modding research and datamining.
CascView is a utility for browsing and extracting files from Blizzard CASC storages. For Diablo II: Resurrected it is mainly useful as a modding and research tool: players and modders can inspect game archives, extract assets, browse file structures and prepare local modding workflows. It should be listed as a Tool rather than a server because it does not provide gameplay, online realms or multiplayer services. CascView is best described as a read-only archive viewer and extractor, not a CASC editor. For D2 Horadric it belongs near other technical tools used by modders, dataminers and advanced D2R players.