Citrix Systems, Inc. is an American multinational cloud computing and virtualization technology company that provides server, application and desktop virtualization, networking, software as a service (SaaS), and cloud computing technologies.
NetScaler is an application delivery controller (ADC) platform designed to optimize, secure and control the delivery of applications. Its functionality includes load balancing, traffic management, SSL/TLS offloading, application acceleration and application security.
NetScaler is proprietary software. We recommend the best free and open source alternatives for Linux.
The software featured here offers alternatives to NetScaler’s core ADC and application-delivery functionality. None individually duplicates NetScaler’s entire integrated stack, which also encompasses areas such as web application firewalling, API security and bot management.
1. HAProxy
HAProxy is a high availability load balancer and proxy server for TCP and HTTP-based applications that spreads requests across multiple servers.
It is particularly suited to high-traffic environments and offers Layer 4 and Layer 7 load balancing, health checking, traffic routing, TLS termination, connection management and high availability.
HAProxy is an excellent choice where NetScaler is primarily being used to distribute application traffic efficiently and reliably across multiple backend servers.
2. Traefik Proxy
Traefik Proxy is a modern reverse proxy and load balancer designed particularly for dynamic infrastructure.
It integrates with infrastructure components including Docker, Kubernetes, Consul and other service discovery systems, automatically adapting its routing configuration as services are created, removed or changed.
supports load balancing, automatic TLS certificate management, middleware, health checks and multiple protocols. It is particularly attractive for containerized applications and cloud-native environments where infrastructure changes frequently.
3. NGINX Open Source
NGINX Open Source is a high-performance web server, reverse proxy and load balancer.
Besides serving web content, NGINX can proxy and distribute HTTP, TCP and UDP traffic across backend services. It offers TLS termination, connection handling, caching and flexible request routing.
Its event-driven architecture enables it to handle large numbers of concurrent connections efficiently. NGINX is a mature option for organizations looking to replace the reverse proxy and load-balancing elements of a NetScaler deployment.
4. OpenResty
OpenResty is a programmable web application and gateway platform built around the NGINX core, LuaJIT and a collection of NGINX modules.
It retains NGINX’s high-performance event-driven architecture while allowing application-delivery behaviour to be extensively customized with Lua.
OpenResty can implement sophisticated routing, authentication, access control, caching, request processing and traffic-management logic. It is particularly interesting where NetScaler is being used for more complex application-delivery policies that go beyond straightforward reverse proxying and load balancing.
For more open source load balancers, check out our roundup of the finest free and open source load balancers.
All articles in this series:
| Alternatives to Citrix's Products | |
|---|---|
 | Podio is a cloud-based collaboration platform that helps businesses organize work, manage projects, and streamline workflows. |
 | Wrike is a collaborative work management solution. This allows end users to become even more productive and be able to stay on track of projects. |
 | XenServer (previously Citrix Hypervisor) is a hypervisor optimized for the Citrix platform. |
| NetScaler is an application delivery controller providing load balancing, traffic management, application acceleration, and security services. |
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