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Stop Storing Third-Party Tokens in Your Database
Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
Vitalnix is a suite consisting of a library providing unified methods to access different user databases (Shadow, LDAP, etc), tools for user/group management, and a program for managing users in batch, suitable for large systems.
Portable multi-platform backup tool with advanced features
ZipSnapNG is a portable multi-platform backup tool which, despite its simplicity (200Kb and no installation required), provides advanced features such as incremental backup, data deduplication, encryption and configurable retention.
It may run through the command line or within a graphical interface.
/usr/bin/passwd offers a "safe way" for root to edit /etc/passwd (or shadow). If setuid it allows regular users to change passwd without asking root to do changes for them.
(note: does have learning curve on args to choose)
gnupasswd - gnu change user password
gnugpasswd - gnu change group password
gnupasswd(1) has a goal to work with older login.c/linux and some newer too, also "getpwent" (any glibc).
Local User Management Made Simple (lumms) is a local user manager for Linux, AIX and Solaris. It allows you to change local user accounts, groups including passwords from one place. This will update on all hosts the local passwd and shadow files.
GTBACKUP is a server / client backup application designed to utilize RSYNC to create full offsite (or onsite) backups of Windows and Linux servers. This includes the ability to create differential backups to save space on your backup server.
OrgLDAP is an extensible LDAP user management application supporting groups, *NIX (POSIX, Shadow), Samba and other account types, SSH public keys and sudo roles. It includes a reusable extensible library and a web-based front-end.
It provides a PAM and NSS module for PostgreSQL to completely replace the user/group/shadow flatfile. Maintenance tools are developed by the bofhms project, code has been moved to http://www.pgfoundry.org/projects/sysauth/
xrBackup is backup software for Mac OS X that uses an innovative combination of HFS-enabled rsync together with disk image shadow files to perform differential backups. It is the successor to the Perl-based rbackup project, built using a native Cocoa GUI
Yap2lc (Yet Another Passwd 2 LDIF Converter) is an LDAP migration tool, which extracts information from passwd, shadow/passwd, and master.passwd formatted files, filters out unwanted/misshapen accounts and writes an LDIF file for easy importing.
WISDOM is a 32-bit operating system with a primitive shell implemented. It is copyrighted under GNU/GPL license. WISDOM is also a research into the field of design of operating system. Operating System Development has been in the shadow in recent times.
Shadow Watcher is a Peer to Peer log sharing tool for the security analyst. Consider it a "community watch" program which allows you to keep your system secure from the threats on the internet and help others do the same.
NISLDAP is attempt to bridge the gap between NIS and LDAP. It works by pulling info from an LDAP DB and formatting the data into passwd, shadow, aliases and so on to be read by ypmake to create NIS maps.
[Daemon] Watches files such as /etc/passwd, /etc/shadow, /etc/group. When they are modified, make is automagically run in the NIS directory (often /var/yp) to update and push out new NIS maps.