A full example of a collaborative text editor written in Rails and JavaScript.

Learn how to design large-scale systems. Prep for the system design interview. Includes Anki flashcards.

How to systematically secure anything: a repository about security engineering

Catch unsafe PostgreSQL migrations in development and run them easier in production (code helpers for table/column renaming, changing column type, adding columns with default, background migrations…

RSpec Tracer is a specs dependency analyzer, flaky tests detector, tests accelerator, and coverage reporter tool.

A syntax-highlighting pager for git, diff, grep, and blame output

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From…

A black hole for Internet advertisements

Open-source KVM software

⚠️ [Deprecated] No longer maintained, please use https://github.com/fengyuanchen/jquery-cropper

Interactively grep source code. Source for http://livegrep.com/

Flay analyzes code for structural similarities. Differences in literal values, variable, class, method names, whitespace, programming style, braces vs do/end, etc are all ignored.

Browser extension that visually merges the same event on multiple Google Calendars into one event.

The OpenAPI Specification Repository

Complex image effects with CSS

Automated auditing, performance metrics, and best practices for the web.

GitHub's Online Schema-migration Tool for MySQL

Maps + Teams

FlatBuffers: Memory Efficient Serialization Library

Peace of mind from prototype to production

[UNMAINTAINED] A next generation open source platform as a service (PaaS)

🐠 Babel is a compiler for writing next generation JavaScript.

A command line tool for bulk geolocation queries written in C++.

Ruby-like hybrid OOP/functional programming language for BEAM, the Erlang VM

The Crystal Programming Language

A list of SaaS, PaaS and IaaS offerings that have free tiers of interest to devops and infradev

browser-side require() the node.js way

prototype of stream based programming language

Very efficient backup system based on the git packfile format, providing fast incremental saves and global deduplication (among and within files, including virtual machine images). Please post prob…