Windows Server 2019 Alternatives

TrueNAS Core (formerly FreeNAS) is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.

OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.

Open Source

Stop chasing your clients for documents! Easily request files, documents, forms & signatures from your clients – set a due date and save hours as your requests are returned to you effortlessly.

Try for free paid Free Trial $17.99 / Monthly (Basic)

Simplicity. Flexibility. Scalability. Modularity. Unraid empowers you to build the system you’ve always wanted using your preferred hardware, software, and operating systems.

Secure, fast and economically scalable, Ubuntu helps you make the most of your infrastructure. Whether you want to deploy a cloud or a web farm, Ubuntu Server supports the most popular hardware and software.

Rockstor is a free and open source NAS (Network Attached Storage) operating system.

A backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures.

File Sharing, OS & Utilities, and Security & Privacy

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

PetaSAN is an open source Scale-Out SAN solution offering massive scalability and performance.

Enterprise Storage OS. An open source, high performance, block-level storage platform.

Open Source

Windows Server Essentials (formerly Windows Small Business Server) is a flexible, affordable, and...

State of the art, file based drive pooling software.

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