"The Pilot" by Bryan James
(also appears in LZR-1143 Perspectives)
"For Elise" by Evan R.
"Grace Period" by D.L. Snell
The Living Dead 2Edited by John Joseph Adams
Selections from the anthology are available online for free.
Includes work by Carrie Ryan, David Moody, David Wellington, and others.
There are more selections from The Living Dead anthologies online, too.
Adrian's Undead DiaryBy Chris Philbrook
This is one of the first, and best developed, online zombie stories told in blog form.
Start with Episode One.
Or use the complete archives.
There are a few stories posted for free at The Morningstar Saga website.
One is by Z.A. Recht himself.
Living With The DeadBy Josh Guess
A blog-form ongoing story of life among the living dead.
What Zombies FearBy Victor Tookes (Kirk Allmond)
What Zombies Fear has four different books in the series. These stories are part of the saga.
All Things ZombieVarious Authors
Free online zombie stories at allthingszombie.com
Tales of the Zombie WarVarious Authors
Find short and long stories on Tales of the Zombie War along with many, many contest-winning entries.