Providing central user authentication typically is a burden, requiring a network admin battling active directory for days, if not weeks;
you need to invest in beefy servers and perform regular maintenance.
→ With GLAuth, security is as easy as running a single, portable executable on the OS of your choice, and ocasionally updating your users' list.
Keep using your legacy systems. GLAuth, as a gateway, injects security features like Two-Factor or TLS support.
Use GLAuth standalone and implement support for groups, SSH keys, home environments, Two-Factor, app passwords and physical tokens.
Store your users in your backend of choice: simple flat files, local or in S3; OwnCloud; SQL Databases or LDAP.