[Manip]

List of CSS classes:
CAK47
CBaseAnimating
CBaseAnimatingOverlay
CBaseCombatCharacter
CBaseCombatWeapon
CBaseCSGrenade
CBaseCSGrenadeProjectile
CBaseDoor
CBaseEntity
CBaseFlex
CBaseGrenade
CBaseParticleEntity
CBasePlayer
CBaseTempEntity
CBaseViewModel
CBeam
CBoneFollower
CBreakableProp
CBreakableSurface
CC4
CCSGameRulesProxy
CCSPlayer
CCSPlayerResource
CCSRagdoll
CCSTeam
CDEagle
CDynamicLight
CDynamicProp
CEmbers
CEntityDissolve
CEntityFlame
CEntityParticleTrail
CEnvDetailController
CEnvParticleScript
CEnvQuadraticBeam
CEnvScreenOverlay
CEnvWind
CFireSmoke
CFlashbang
CFunc_Dust
CFunc_LOD
CFuncAreaPortalWindow
CFuncConveyor
CFuncLadder
CFuncMonitor
CFuncOccluder
CFuncSmokeVolume
CFuncTrackTrain
CGameRulesProxy
CHandleTest
CHEGrenade
CHostage
CInfoLadderDismount
CInfoLightingRelative
CKnife
CLightGlow
CMaterialModifyControl
CParticleFire
CPhysBox
CPhysBoxMultiplayer
CPhysicsProp
CPhysicsPropMultiplayer
CPhysMagnet
CPlantedC4
CPlasma
CPlayerResource
CPointCamera
CPrecipitation
CPredictedViewModel
CPropJeep
CPropVehicleDriveable
CRagdollManager
CRagdollProp
CRagdollPropAttached
CRopeKeyframe
CShadowControl
CSmokeGrenade
CSmokeStack
CSpotlightEnd
CSprite
CSpriteTrail
CSteamJet
CSun
CTeam
CTEArmorRicochet
CTEBaseBeam
CTEBeamEntPoint
CTEBeamEnts
CTEBeamFollow
CTEBeamLaser
CTEBeamPoints
CTEBeamRing
CTEBeamRingPoint
CTEBeamSpline
CTEBloodSprite
CTEBloodStream
CTEBreakModel
CTEBSPDecal
CTEBubbles
CTEBubbleTrail
CTEDecal
CTEDust
CTEDynamicLight
CTEEffectDispatch
CTEEnergySplash
CTEExplosion
CTEFireBullets
CTEFizz
CTEFootprintDecal
CTEGaussExplosion
CTEGlowSprite
CTEImpact
CTEKillPlayerAttachments
CTELargeFunnel
CTEMetalSparks
CTEMuzzleFlash
CTEParticleSystem
CTEPhysicsProp
CTEPlantBomb
CTEPlayerAnimEvent
CTEPlayerDecal
CTEProjectedDecal
CTERadioIcon
CTEShatterSurface
CTEShowLine
CTesla
CTESmoke
CTESparks
CTESprite
CTESpriteSpray
CTest_ProxyToggle_Networkable
CTestTraceline
CTEWorldDecal
CVGuiScreen
CWaterBullet
CWaterLODControl
CWeaponAug
CWeaponAWP
CWeaponCSBase
CWeaponCSBaseGun
CWeaponCubemap
CWeaponCycler
CWeaponElite
CWeaponFamas
CWeaponFiveSeven
CWeaponG3SG1
CWeaponGalil
CWeaponGlock
CWeaponM249
CWeaponM3
CWeaponM4A1
CWeaponMAC10
CWeaponMP5Navy
CWeaponP228
CWeaponP90
CWeaponScout
CWeaponSG550
CWeaponSG552
CWeaponTMP
CWeaponUMP45
CWeaponUSP
CWeaponXM1014
CWorld
MovieExplosion
ParticleSmokeGrenade


List of HL2:DM classes:
CAI_BaseNPC
CAlyxEmpEffect
CBaseAnimating
CBaseAnimatingOverlay
CBaseCombatCharacter
CBaseCombatWeapon
CBaseDoor
CBaseEntity
CBaseFlex
CBaseGrenade
CBaseHelicopter
CBaseHL2MPCombatWeapon
CBaseHLBludgeonWeapon
CBaseHLCombatWeapon
CBaseParticleEntity
CBasePlayer
CBaseTempEntity
CBaseViewModel
CBeam
CBoneFollower
CBreakableProp
CBreakableSurface
CCitadelEnergyCore
CCorpse
CCrossbowBolt
CDynamicLight
CDynamicProp
CEmbers
CEntityDissolve
CEntityFlame
CEntityParticleTrail
CEnvHeadcrabCanister
CEnvParticleScript
CEnvQuadraticBeam
CEnvScreenOverlay
CEnvStarfield
CEnvWind
CFireSmoke
CFireTrail
CFlare
CFunc_Dust
CFunc_LOD
CFuncAreaPortalWindow
CFuncConveyor
CFuncLadder
CFuncMonitor
CFuncOccluder
CFuncSmokeVolume
CFuncTrackTrain
CGameRulesProxy
CHalfLife2Proxy
CHandleTest
CHL2_Player
CHL2MP_Player
CHL2MPGameRulesProxy
CHL2MPMachineGun
CHL2MPRagdoll
CHLMachineGun
CHLSelectFireMachineGun
CInfoLadderDismount
CInfoLightingRelative
CInfoTeleporterCountdown
CLaserDot
CLightGlow
CMaterialModifyControl
CMortarShell
CNPC_Barnacle
CNPC_Barney
CNPC_CombineGunship
CNPC_Manhack
CNPC_RollerMine
CNPC_Strider
CParticleFire
CPhysBox
CPhysBoxMultiplayer
CPhysicsProp
CPhysicsPropMultiplayer
CPhysMagnet
CPlasma
CPlayerResource
CPointCamera
CPrecipitation
CPredictedViewModel
CPropAirboat
CPropCombineBall
CPropCrane
CPropJeep
CPropVehicleDriveable
CPropVehiclePrisonerPod
CRagdollManager
CRagdollProp
CRagdollPropAttached
CRopeKeyframe
CRotorWashEmitter
CScriptIntro
CShadowControl
CSmokeStack
CSpotlightEnd
CSprite
CSpriteTrail
CSteamJet
CSun
CTeam
CTEAntlionDust
CTEArmorRicochet
CTEBaseBeam
CTEBeamEntPoint
CTEBeamEnts
CTEBeamFollow
CTEBeamLaser
CTEBeamPoints
CTEBeamRing
CTEBeamRingPoint
CTEBeamSpline
CTEBloodSprite
CTEBloodStream
CTEBreakModel
CTEBSPDecal
CTEBubbles
CTEBubbleTrail
CTEConcussiveExplosion
CTEDecal
CTEDust
CTEDynamicLight
CTEEffectDispatch
CTEEnergySplash
CTEExplosion
CTEFizz
CTEFootprintDecal
CTEGaussExplosion
CTEGlowSprite
CTEImpact
CTEKillPlayerAttachments
CTELargeFunnel
CTEMetalSparks
CTEMuzzleFlash
CTEParticleSystem
CTEPhysicsProp
CTEPlayerDecal
CTEProjectedDecal
CTEShatterSurface
CTEShowLine
CTesla
CTESmoke
CTESparks
CTESprite
CTESpriteSpray
CTest_ProxyToggle_Networkable
CTestTraceline
CTEWorldDecal
CVGuiScreen
CWaterBullet
CWaterLODControl
CWeapon357
CWeaponAnnabelle
CWeaponAR2
CWeaponBugBait
CWeaponCitizenPackage
CWeaponCitizenSuitcase
CWeaponCrossbow
CWeaponCrowbar
CWeaponCubemap
CWeaponCycler
CWeaponFrag
CWeaponHL2MPBase
CWeaponPhysCannon
CWeaponPistol
CWeaponRPG
CWeaponShotgun
CWeaponSMG1
CWeaponStunStick
CWorld
MovieExplosion
ParticleSmokeGrenade
RocketTrail
SmokeTrail
SporeExplosion
SporeTrail

[vancelorgin]

	ServerClass* s = pGameDLL->GetAllServerClasses();

	do {
		LOG("Class: [%s]", s->GetName());
	}while(s = s->m_pNext);

You go girl :s

[Geesu]

And is it possible for us to use all of these?

[Manip]

You should be able to construct any of these, yes.

[vancelorgin]

The ent classes at least are created through entityfactorydictionary, called by cbaseentity::create, referenced by their entity name [LINK_ENTITY_TO_CLASS]. I got the sig for entityfactorydictionary (it was in my sig post), so you can 'properly' add your own ents or override ents with that.