GoCenter, a free repository of versioned Go modules, was sunset on May 1, 2021, but previously played a critical role in managing Go modules, particularly in handling pseudo-versions as Go evolved to versions 1.13 and 1.14. Pseudo-versions, which are used when a module doesn't have a tagged release, require careful management to ensure compatibility with Go's semantic versioning system. Go 1.13 introduced stricter rules for pseudo-version validation, necessitating corrections in go.mod files to align with version control metadata, while GoCenter helped developers by updating metadata and redirecting to correct pseudo-versions. Although GoCenter supported various Go versions, its closure marked the end of an era for developers relying on it to navigate Go modules' evolving standards.