Samba

Samba serves as an open source alternative to the traditional domain controller offered by Microsoft.

22 Alternatives To Samba

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ClearOS

A very good alternative for Windows Server, for free

JXplorer

JXplorer is a cross platform LDAP browser and editor. It is a . JXplorer is written in java, and the source code and Ant build system are available via svn or as a packaged build for users who want to experiment or further develop the program.

LDAP Tool Box White Pages

Simple web interface to search and display information form an LDAP directory
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Ldap Admin

Ldap Admin is free Win32 administration tool for LDAP directory management.

Mambo

Mambo is the fastest Bulk Photo, Video Uploader for smugmug. A small & light weight tool that makes it easy & fast to bulk upload photos & videos to SmugMug

NethServer

NethServer is an operating system for Linux enthusiasts, designed for small offices and medium…
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Univention Corporate Server

Univention Corporate Server UCS with Active Directory functions and App Center is the cost-efficient and popular successor to Microsoft’s server solutions.

Zentyal

Linux directory, domain, mail, gateway and infrastructure server for SMBs.

Zimbra

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

pfSense

pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more

phpLDAPadmin

phpLDAPadmin (also known as PLA) is a web-based LDAP client.