Open Source C Load Balancers

RELIANOID is an open core (Debian GNU/Linux based) Application Delivery Controller (ADC) with advanced load balancing features such as Network Load Balancer, Application Load Balancer with SSL offloading, Advance Network Configuration including Virtual Interfaces, VLANs, Bonding with link aggregation, IPv4/IPv6, advanced routing, stateless cluster, web GUI, JSON API and much more! Enterprise Edition Load Balancer is available with extra features such as global service load balancing (gslb), application security including web application firewall (WAF), blacklists, Realtime Blackhole Lists (DNSBL), DDoS protection, stateful clustering, SNMP monitoring, email and SNMP notifications, RBAC, VPN support, and the best Support directly from an expert Team.

Tengine is a web server originated by Taobao, the largest e-commerce website in Asia. It is based on the Nginx HTTP server and has many advanced features. Tengine has proven to be very stable and efficient on some of the top 100 websites in the world, including taobao.com and tmall.com. Tengine has been an open source project since December 2011. It is being actively developed by the Tengine team, whose core members are from Taobao, Sogou and other Internet companies. Tengine is a community effort and everyone is encouraged to get involved. All features of nginx-1.18.0 are inherited, i.e., it is 100% compatible with nginx. Support the CONNECT HTTP method for forward proxy. Support asynchronous OpenSSL, using hardware such as QAT for HTTPS acceleration. Enhanced operations monitoring, such as asynchronous log & rollback, DNS caching, memory usage, etc. Support server_name in Stream module. More load balancing methods, e.g., consistent hashing, and session persistence.

Atlas is a MySQL protocol-based database middleware project developed and maintained by the infrastructure team of the Web platform Department in QIHU 360 SOFTWARE CO. LIMITED(NYSE:QIHU). It fixed lots of bugs and added lot of new functions on the basis of MySQL-Proxy 0.8.2. Currently, the project has been widely applied in QIHU, many MySQL businesses has connected to the Atlas platform. The number of read and write requests forwarded by Atlas has reached billions. Rewrite all lua code with C, Lua is only used for the management interface. Rewrite the network model and the threading model. Optimize the locking mechanism, performance improved immensely. When Atlas start, it will create multiple threads. One of them is the main thread, the others are working threads. The main thread is responsible for monitoring the connecting requests from clients, and the working thread only monitor the command request from the main thread.

FastDFS is an open source high performance DFS ( distributed file system ). It's major functions include: file storing, file syncing and file accessing, and design for high capacity and load balancing.

MsQuic is a Microsoft implementation of the IETF QUIC protocol. It is cross-platform, written in C and designed to be a general-purpose QUIC library. MsQuic also has C++ API wrapper classes and exposes interop layers for both Rust and C#. QUIC has many benefits when compared to existing "TLS over TCP" scenarios. MsQuic has several features that differentiate it from other QUIC implementations. Optimized for client and server. Optimized for maximal throughput and minimal latency. Asynchronous IO. Receive side scaling (RSS) support. UDP send and receive coalescing support. All packets are encrypted and handshake is authenticated with TLS 1.3. Parallel streams of (reliable and unreliable) application data. Exchange application data in the first round trip (0-RTT). Improved congestion control and loss recovery. Survives a change in the clients IP address or port. Stateless load balancing.

MailCleaner Open Source Edition is now discontinued but will continue under the spamtagger project https://github.com/SpamTagger [antispam] MailCleaner is an anti-spam / anti-virus filter SMTP gateway with user and admin web interfaces, quarantine, multi-domains, multi-templates, multi-languages. Using Bayes, RBLs, Spamassassin, MailScanner, ClamAV. Based on Debian. Enterprise ready. MailCleaner is an anti spam gateway installed between your mail infrastructure and the Internet. It includes a complete GNU/Linux OS and a graphical web interface for user and administrative access. It comes in the form of virtual machine templates.. - fully compatible with any SMTP mail server (Exchange, Zimbra, O365,...)

It is a versatile DNS Proxy server with DNS firewall which filters DNS traffic between local computer and DNS servers with flexible rules, supports blocking by IP geography, caching, import/export rules into XML. With a click of a button acts as a DNS proxy (or DNS server), supports multiple client authentication methods, calculates statistics for DNS servers and proxy clients, supports load balancing between multiple upstream DNS servers.

DMTA (Distributed Multithreaded Apriori) is a parallel implementation of Apriori algorithm, which exploits the parallelism at the level of threads and processes, seeking to perform load balancing among the cores. Was implemented in C++ language, using the parallelization libraries OpenMP and MPI. The algorithm was generated as a result of a project developed by André Camilo Bolina, under the guidance of teachers Marluce Rodrigues Pereira, Ahmed Ali Abdalla Esmin and Denilson Alves Pereira, in Department of Computer Science at Federal University of Lavras. The results of this project were published in the Revista de Sistemas de Informação da FSMA and is available in http://www.fsma.edu.br/si/edicao11/FSMA_SI_2013_1_Principal_1.html

XLB is a high performance HTTP load balancer. connection management, caching, ssl, scripting. 300 mbit/sec / 4000 reqs/sec takes 30% cpu on a 2GhZ Xeon. connection pooling to backend servers reduces memory and cpu usage on backends.

Balance is a simple but powerful generic tcp proxy with round robin load balancing and failover mechanisms. Via shared memory its behaviour can be controlled at runtime using a simple command line syntax.

Ballast is a tool for balancing user load across SSH servers that supports user-specific policies as well as traditional policies based on metrics such as CPU load. It includes a simple client, a lightweight data server, and a data collection agent.

CLara is a framework that enables you to access the computing power of many graphics processors in an IP-based network using a kind of Client/Proxy/Server model. Its programming interface conforms to the OpenCL 1.0 standard.

See http://www.cubrid.org/cluster. CUBRID Cluster is an open source clustered DBMS for high scalability including global schema, distributed partition and load balancing features. It is a spin-off project from CUBRID project and supported by NHN.

Core Balance is a simple TCP Load Balancing proxy designed to balance connections based on node speed and number of cores. The design was intended to balance a distcc cluster. It features a status report in HTTP and an interactive mode.

Reference multiplatform implementation of the Cisco Dynamic Feedback Protocol (DFP), used in server farms to perform fine-grained load balancing. NOTE: you need to checkout from SVN, there are no releases yet.

Eddie acts as a high availability WAN and LAN clustering tool for web servers (including Apache). It provides load balancing at two levels (DNS and LAN), failover redundancy, and admission control to maintain quality of service levels.

Queue is a load-balancing system popular in the 2000s that lets users control their remote jobs in an intuitive, transparent and nearly seamless way. Development versions feature job migration with and without kernel support. GNU Queue continues to be downloaded despite being decommissioned by the FSF in favor of the newer GNU Parallel project. Older versions of the code are archived here on Sourceforge and some later versions on GNU Savannah.

A robust load-balancing queuing system for UNIX like systems.

Hive is a reverse proxy server that passes requests from client browsers to a cluster of back-end web servers. It communicates with its monitoring programs residing on each back-end server to achieve precise load-balancing.

Linux Network Load Balancing driver. A transparent network driver to make decentered balancing linux clusters (without use of a central balancer station)

Balancer is an userspace NFQUEUE filter desgned to load-balance traffic across multiple uplink ISP connections. It works on kernels 2.6.14 and above. The purpose of the filter is to keep a session always on the same ISP link where it started.

MOSIXVIEW (GUI for MOSIX-Cluster) is a frontend for the most common used mosctl commands. The Load-Balancing of a MOSIX-clustercan be influenced by "speed-sliders" and even remote processes are manageable. A mosixview-client installed on every cluster-n

Octopus Load Balancer is an extremely fast TCP load balancer with extensions for HTTP to allow balancing based on URI. Features include: server health checks and load polling, dynamic configuration, and the ability to carbon copy incoming requests.

OpenJCS (Job Control System) is a batch scheduling and control system for use on Unix systems which uses load balancing, dependency control, scheduling, runbooks, queueing and resource allocation subsystems for unmatched scalability and flexibility.

This is Pen, a load balancer for udp and tcp based protocols such as dns, http or smtp. It allows several servers to appear as one to the outside and automatically detects servers that are down and distributes clients among the available servers. This gives high availability and scalable performance.