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Environment

env_airstrike_indoors - Adds an airstrike effect for indoors (crumbling ceiling)
env_airstrike_outdoors - Adds an airstrike effect for outdoors
env_instructor_hint - Allows creation and control of instructor messages through map logic

filter_health - Can filter based on the health of the activator, and wheter they have adrenaline active or not
filter_melee_damage - Can filter based on melee damage, and the type (all, slash or club)

func_block_charge - The Charger will not charge through this brush.
func_instance - An entity for placing an instance of a map file
func_instance_parms - Controls parameters used in func_instance within an instance
func_nav_connection_blocker - Blocks nav meshs (on creation) from being connected through it's volume.
func_playerghostinfected_clip - Blocks ghost infected.
func_timescale - Adjust the time scale of the server/client through map logic (slow-mo scene at end of Dead Center finale)

info_ambient_mob_start - Potential starting area for an ambient mob
info_ambient_mob_end - Potential end area for an ambient mob
info_ambient_mob - universal ambient mob start/end (use with care)
info_particle_target - Allows marking areas in the map for particle systems with control points to reference
info_zombie_border - Zombies will not spawn behind this entity.

ambient_music - Can override the Music Director, forcing a custom wav file to play in the music mix layer.
game_scavenge_progress_display - Allows turning the scavenge score display on/off as well as setting the total items required.
player_weapon_strip - removes specific weapon or active weapon
point_nav_attribute_region - Holds attributes to be applied to regions of nav areas during generation
prop_mounted_machine_gun - A .50 Cal mounted machine gun.
Note:Currently L4D2 does not support the prop_minigun, so you will need to replace them with this entity instead when updating your addons.
sound_mix_layer - Allows setting the levels of a specific sound mix layer.
trigger_active_weapon_detect - Fires output when touched by a player that has a specific weapon active

upgrade_spawn - Allows the director to place gun upgrades: laser sights, explosive ammo, and incendiary ammo.
weapon_adrenaline_spawn - A possible spawnpoint for adrenaline
weapon_chainsaw_spawn - A possible spawnpoint for chainsaws
weapon_defibrillator_spawn - A possible spawnpoint for defibrillators
weapon_grenade_launcher_spawn - A possible spawnpoint for grenade launchers
weapon_item_spawn - A possible spawnpoint for a random item (first aid kits, pills, adrenaline, bile bombs, defibrillators etc.)
weapon_melee_spawn - A possible spawnpoint for random melee weapons
weapon_pistol_magnum_spawn - A possible spawnpoint for magnum pistols
weapon_rifle_ak47_spawn - A possible spawnpoint for AK-47's
weapon_rifle_desert_spawn - A possible spawnpoint for combat rifles
weapon_scavenge_item_spawn - A spawnpoint for a scavenge gas can
weapon_shotgun_chrome_spawn - A possible spawnpoint for chrome shotguns
weapon_shotgun_spas_spawn - A possible spawnpoint for combat shotgun
weapon_smg_silenced_spawn - A possible spawnpoint for silenced submachineguns
weapon_sniper_military_spawn - A possible spawnpoint for military sniper rifles
weapon_spawn - A possible spawnpoint for random weapons
weapon_upgradepack_explosive_spawn - A possible spawnpoint for explosive ammo
weapon_upgradepack_incendiary_spawn - A possible spawnpoint for incendiary ammo
weapon_vomitjar_spawn - A possible spawnpoint for bile bombs

env_fog_controller - Has new entrys/inputs for settings such as Set2DSkyboxFactorLerpTo (Amount of fog to blend into 2d Skybox to lerp to)
env_tonemap_controller - Can now set TonemapPercentBrightPixels, and other settings.

func_elevator - Added input to set max speed dynamically
func_move_linear - Added ResetPosition/TeleportToTarget
func_nav_blocker - Added toggle to determine if nav flow should be recomputed or not
func_orator - Now allows setting the max legal followup distance for automatic responses
func_precipitation - Added Rain Storm, Bugs, and Smoke
func_push - Added OnStartTouch output, and input SetMaxSpeed to allow setting the push speed dynamically
func_rotating - Added SnapToStartPosition

info_director - Added many outputs to fully customize scavenge games, also includes scripting and journal support.
info_gamemode - Added additional game modes, added OnNavAnalyze output which is fired only when map is loaded with -navanalyse command line option set
info_particle_system - Added setting to allow forcing particles to always render infront of everything
info_survivor_position - Can now be tied to a specific gamemode, and given a specific intro to play

Worldspawn - Can now choose time of day (evening, midnight, etc..), music post-fix name (for Music soundscripts to reference), as well as starting music type (Mission Start, Check Point)
beam_spotlight - Added NoFog spawnflag.
sky_camera - Added additional options for customizating plane clipping offsets, etc
filter_activator_infected_class - Added the new special infected
logic_auto - Added 'OnDemoMapSpawn' output
postprocess_controller - Can now dynamically alter film grain and vignette strength

point_hurt - Added additional damage type: "FULLGIB"
point_spotlight - Added option to set Halo size
point_viewcontrol_multiplayer - Updated with additional inputs, toggles, and most importantly it now supports 'Target Entity' to easily create simple smooth gliding intro animations without relying on custom model animations.

All props now have a 'Lag Compensation' toggle. (Use sparingly!)
prop_car_alarm - Added ability to enable/disable
prop_door_rotating - Added 'glow' option
prop_physics - Added OnHitByTank output, for creating custom events when a prop is punched by the tank.

trigger_finale - Added types selection: "Standard" "Gauntlet" "Custom" "Scavenge", and a property to define max points for scavenge mode.
trigger_hurt - Added additional damage type: "FULLGIB", and the option to have it 'think' every frame instead of every half second. (Expensive!)