[Dragokas]

Skip it. Already included in 1st post:

Spoiler

L4D2:

[L4D & L4D2] Engine Fix by disawar1
[L4D & L4D2] Physics fix by disawar1
[L4D & L4D2] Survivor Crawl Pounce Fix by McFlurry
[L4D & L4D2] Physics Push Fix by SilverShot
[L4D & L4D2] Stuck Zombie Melee Fix by AtomicStryker
[L4D2] Global Shadow Fix by SilverShot
L4D2 Realism Penetration Fix by dcx2
[L4D2] SG552 Reload Fix by McFlurry
L4D2 Witch Fire Fix by dcx2
No Mercy Elevator Fix by Mr. Zero

[Client-Side] Increase console font size by dr.lex

Though, I am a noob in L4D2. This is my friend's list suggestion.
Please, comment if something wrong with that.

Here is what I personally use:

L4D1:

[L4D, L4D2] No Death Check Until Dead by chinagreenelvis
[L4D2]Witch fixes by Lux[Left 4 Fix] (allow witch in safezone)
[L4D1] Health Exploit Fix by Dragokas
[L4D] Tank anti-stuck (anti-block) by Dragokas
[ANY] !COMMAND eater by Dragokas
[ANY] Command and ConVar - Buffer Overflow Fixer by SilverShot
[ANY] ConVars Anomaly Fixer by Dragokas
And some private stuff to block afk on incap / witch startle etc. + lot of security & punishment features