Lightning's projects:

MyIP with country flag

Information page that tells you your IP address, country, browser used and something else.

D&D 3.5e Reference guide

A complete reference guide (spells, monsters, classes, races, feats, and much more) for Dungeons&Dragons 3.5 edition.
Built by Sovelior.

D&D 5e Reference guide

A complete reference guide (spells, monsters, classes, races, feats, and much more) for Dungeons&Dragons 5th edition.
Built by Vitusventure.

Dice roller

Supports d4, d6, d8, d10, d12, d20, dXX. A must have!
By Wizards of the Coast.

psyBNC

Opensource IRC bouncer by the most psychoid.

Bouncer

General purpose bouncer, outdated but still useful, by Chris Mason. It supports: redirects, socks protocol, ssl, authentication, ip filtering, daemon mode, logging and some other tweaks.

Barricade

Opensource Port Knocker written by Francesco Vannini.

Network calculator

Simple utility to calculate networks, CIDR and so on. By subnetmask.info.
Dedicated to my friend YaP ;)