Current status: Under active development. Currently in use in several highly loaded production environments.

Written in Go and some interesting features, like health checks and more.

Fast L4 Load Balancing
    TCP - with optional The PROXY Protocol support
    TLS - TLS Termination + ACME & TLS Proxy
    UDP - with optional virtual sessions and transparent mode

Clear & Flexible Configuration with TOML or JSON
    File - read configuration from the file
    URL - query URL by HTTP and get configuration from the response body
    Consul - query Consul key-value storage API for configuration

Management REST API
    System Information - general server info
    Configuration - dump current config
    Servers - list, create & delete
    Stats & Metrics - for servers and backends including rx/tx, status, active connections & etc.

Discovery
    Static - hardcode backends list in the config file
    Docker - query backends from Docker / Swarm API filtered by label
    Exec - execute an arbitrary program and get backends from its stdout
    JSON - query arbitrary http url and pick backends from response json (of any structure)
    Plaintext - query arbitrary http and parse backends from response text with customized regexp
    SRV - query DNS server and get backends from SRV records
    Consul - query Consul Services API for backends
    LXD - query backends from LXD

Healthchecks
    Ping - simple TCP ping healthcheck
    Exec - execute arbitrary program passing host & port as options, and read healthcheck status from the stdout
    Probe - send specific bytes to backend (udp, tcp or tls) and expect a correct answer (bytes or regexp)

Balancing Strategies (with SNI support)
    Weight - select backend from pool based relative weights of backends
    Roundrobin - simple elect backend from pool in circular order
    Iphash - route client to the same backend based on client ip hash
    Iphash1 - same as iphash but backend removal consistent (clients remain connecting to the same backend, even if some other backends down)
    Leastconn - select backend with least active connections
    Leastbandwidth - backends with least bandwidth

Integrates seamlessly with Docker and with any custom system (thanks to Exec discovery and healthchecks)

Single binary distribution