Stack trace visualizer

SICP PDF with Texinfo and LaTeX source

Nginx Tutorials

Real-time analysis and diagnostics tools for OpenResty (including NGINX, LuaJIT, ngx_lua, and more) based on SystemTap

Bucardo multimaster and master/slave Postgres replication

Simple macro language extentions to systemtap

Nagios check_postgres plugin for checking status of PostgreSQL databases

Data-driven test scaffold for Nginx C module and OpenResty Lua library development

Pulled Pork for Snort and Suricata rule management (from Google code)

"Perlito" Perl programming language compiler

Erlang Enhancement Proposals

Enterprise Log Search and Archive

Parse any language you can describe in BNF

A rule-based sysadmin tool that helps setting up complex environment for blank machines

graph visualization tool

Convert large plain text files to MP3 files via Amazon Polly

Pegex Parser for Perl