The following commands are 'normal' game commands, but can be used as a cheat, depending on their setting.

cg_3rd_person 	-> 0/1: when on '1' it means they are (trying to) using 3rd person.
cg_forceModel 	-> 0/1: when on '1' people are using force models, some servers might not allow/want this.
cg_shadows	-> 0/1/2/3: when >0 it will show shadows on each player, 3 is really buggy and can be used to see people through walls. Some servers won't allow any shadow.
cg_cameraverticaldisplacement -> when on -18 it will help 3rd person attempts.
g_showbullettrace -> 0/1: When on '1' it might be used as a cheat to see where bullets come from and go to.
r_drawbrushes 0                   	-> WallHack
r_drawbrushmodels 0 + r_novis > 1 	-> Door Hack
r_drawstaticmodels 0			-> Static Models Hack (Transparent Trees, Bushes, Rocks, Vehicles)
r_drawstaticmodelspoly 0		-> Static Models Hack (Transparent Trees, Bushes, Rocks, Vehicles)
r_drawworld 0 + r_novis > 1       	-> WallHack (Only Doors and Windows)
r_farplane_nofog > 1			-> No Fog
r_farplane_nofog > 1 + r_farplane > 1 + r_farplane_nocull > 1	-> No Fog with no vision range limitation
r_lightmap > 1				-> White Walls
r_picmip > 2				-> When higher than 2, it will decrease texture quality, bushes will start disappearing and advantages will be gained. 0 is the best value.
r_fastsky > 0				-> When higher than 0, it will change sky color.
r_fullbright > 0
r_light_nolight >0			-> Illuminates models
r_light_showgrid > 0
r_mapOverBrightBits >1<			-> Darkens or Lightens map too much
r_nobind > 0
r_overbrightbits >0 			-> Darkens things
r_showcull >0
r_showsky >0
r_showSmp >0
r_singleshader >0 			-> Fucks up graphics
r_vertexlight >0			-> Removes all shadow, some texturs transparent
R_static_shadermultiplier3 0 		-> Stops foliage from moving
r_intensity >1

If you catch any player with one the following commands, they are most likely hacking or using a hexed mohaa.exe.

acheat 
as_forcemodel 
cg_3rd_p3rs0n 
cg_3rd_perzon 
cg_6rd_person 
cg_c4meraverticaldisplacement 
cg_cam3rav3rticaldisplac3m3nt 
cg_f0rc3m0d3l 
cg_forcefucka  
cg_forseModel 
cg_fxrcxmxdxl 
cg_shaows 
cg_te_dietouch 
ch34tz 
che3ts 
cr_aim 
cr_aimbot 
cr_aimpriority 
cr_aimvec_x 
cr_aimvec_y 
cr_aimvec_z
cr_autoshoot 
cr_ballhack 
cr_bignades 
cr_blimp 
cr_bonepoints 
cr_boxesp 
cr_brightskins 
cr_chamnades 
cr_distanceesp 
cr_esp_x 
cr_esp_y 
cr_esp_z 
cr_fov_x 
cr_fov_y 
cr_hairyballs 
cr_headpoints 
cr_hitbox_x
cr_hitbox_y
cr_hitbox_z
cr_hitboxes 
cr_ignoreglass 
cr_itemchams 
cr_itemesp 
cr_laser 
cr_locksensitivity 
cr_mirror 
cr_mirror_h
cr_mirror_w
cr_mirror_x
cr_mirror_y
cr_nameesp 
cr_namestealer 
cr_playerchams 
cr_preaimtime 
cr_prediction 
cr_radar 
cr_radarbackground 
cr_radarcheck 
cr_skeletonesp 
cr_spamtime
cr_wallhack 
cr_weaponesp 
cr_zoomcam 
cr_zoomcam_h
cr_zoomcam_w
cr_zoomcam_x
cr_zoomcam_y
cr_zoomcamlevel_2
cr_zoomedsensitivity
creditsmenu 
dis3_ballhack 
dis3_chams 
dis3_fog 
dis3_negative 
dis3_nightmode 
dis3_triangles 
dis3_walls 
dis3_weapons 
dis3_whitewalls 
dis3_zoom 
dis4_ballhack 
dis4_blood 
dis4_bush 
dis4_chams 
dis4_crosshair 
dis4_fog 
dis4_fullbright 
dis4_negative 
dis4_nightmode 
dis4_sky 
dis4_triangles 
dis4_walls 
dis4_weapons 
dis4_whitewalls 
dis4_zoom 
dm_plxyxrgxrmxnmxdxl
dm_plxyxrmxdxl 
dobufferexploit
dp3menu 
e_Aura 
e_Ballhack 
e_Boxhack 
e_Chams 
e_Glow 
e_Locator 
e_NoFog
e_Points 
e_TargetBox 
e_TriESP 
e_TriggerBot 
e_ViewSize 
e_WESP 
e_WireChams 
e_WireChams 
e_XHair 
e_XRV 
e_Zoom 
espthroughwalls 
fgren 
g_sxnchrxnxxsclxxnts 
g_synchr0n0uscli3nts 
glow 
guns
hack 
hacked 
ib_burstdelay 
ib_burstduration 
ib_doaim 
ib_doshoot 
ib_esp 
ib_fov 
ib_getvector 
ib_hud 
ib_predict 
ib_setvector 
ib_team 
ib_time 
ib_wallhack 
itemradar 
name_esp 
pb_autoshoot 
pb_chamitems 
pb_chamskins 
pb_clearscopes 
pb_crosshairmessage 
pb_norecoil 
pb_shootthroughwalls 
picmip_4 
r_f3rpl3n3_n0f0g 
r_f4rp14n3_n0f0g 
r_f4rpl4n3_n0f0g 
r_fightm4p 
r_fullbr1ght 
r_l1ghtm4p 
r_lxght_nxlxght  
r_p1cm1p 
r_p1cmap 
r_picmap 
radar 
screensh0t
screenshit
scv2_bush 
scv2_chams 
scv2_fog 
scv2_negative 
scv2_nightmode 
scv2_sky 
scv2_weapons 
scv2_whitewalls 
sgreenshot 
uk_3rd_p3rs0n 
vectorlight 
vv_3rd_person 
wambot 
wb_aim1 
wb_aimbot 
wb_aimfov 
wb_aimhelp 
wb_aura 
wb_autoshoot 
wb_bot 
wb_distance 
wb_enemybehind 
wb_enemytrace 
wb_espthruwalls 
wb_flashenemies 
wb_flashlight 
wb_glow 
wb_headesp 
wb_ignorewalls 
wb_item_esp 
wb_itemradar 
wb_items 
wb_lights 
wb_lockmethod 
wb_ltintensity 
wb_name_esp 
wb_names 
wb_pingpred 
wb_radar 
wb_time 
wb_wallhack 
wb_wambot 
wb_wbmenu 
wb_weapons 
wb_zoomfov 
wbitem_esp 
wbmenu 
wbname_esp 
wbot 
x__forceModel 
x_farplane 
x_farplane_nocull  
x_farplane_nofog  
x_novis 
xg_3rd_person  
xx_3rd_person 
xx_forcemodel 