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craigslist is a big believer in open source software, and relies on Linux, MySQL, Perl, Apache, Sphinx, Redis, Haraka, and many others.

craigslist (CL) has released the following open source projects:

CL blob service - a simple HTTP-based, multi-master storage service designed for scale-out and multi-datacenter deployments:

multi-master architecture with no single point of failure

scales well for both read and write intensive workloads

tracks TTLs for automatic expiration and purging of blobs

designed for both local and multiple data center replication

pluggable index and storage interface (uses SQLite for index and filesystem for storage by default)

CL image service - large scale image resizing and processing HTTP service:

flexible API to choose any quality, size, and center-cropping

automatically handles orientation operations from EXIF data

stores resized images in the blob service (could use other stores)

memcache cluster proxy (MCP) - a high-performance modular clustering HTTP reverse proxy:

high-performance event-driven daemon

flexible configuration, easily extensible framework

uses standard memcached memory store for caching

supports PCRE and rule-based traffic routing by URL, headers, and more

tracks health of origin servers, routes around failures

provides configurable URL redirects, rewrites, and real-time header transformations

In addition, craigslist contributes code to the following open source projects:

Haraka:

added the smtp_client code that helps support pooled connections for proxy queues

rewrote all of the smtp_proxy and smtp_forward code

major contributions to the test suite

plugin that does strict DNS checking, DNS access control lists

contributions to bannering support

logging infrastructure changes for more robust logging

plugins for aliases, access lists, etc.

Redis:

perl-AnyEvent-Redis-Federated: an event-based redis client that implements client-side sharding in Perl

redis_util: s collection of utilities for node-redis

provided support for included config files

Sphinx:

provided the original persistent connections implementation

craigslist sponsors useful sphinx feature developments, such as the TRUNCATE INDEX command for real-time sphinx

The craigslist Charitable Fund supports open source nonprofit organizations including: