Commands:

cl_hud_color cl_hud_color [HUD Color] This is the console command used to change and customize the color of your HUD (heads up display). It can be changed to a variety of colors, which we have listed examples for.
cl_hud_playercount_showcount cl_hud_playercount_showcount [0 / 1] This useful console command customizes your HUD by changing the display of players alive on each team from showing each of their Steam avatars to just showing a number for how many of each team is alive.
cl_hud_radar_scale cl_hud_radar_scale [Radar Scale] This useful console command controls how much room in your HUD your radar takes up. You can choose to make it a smaller feature or larger than the default value.
cl_radar_scale cl_radar_scale [Radar Scale] This command adjusts the scale of your radar, which affects how zoomed in or out the radar is. A lot of players use this command to zoom the radar out and have a complete view of the map.
cl_showfps cl_showfps [0 / 1] This command produces a simple FPS (frames per second) count in the top left corner of your screen. Unlike the net_graph command, the only value shown is your FPS, which some players like for its simplicity.
cl_radar_always_centered cl_radar_always_centered [0 / 1] This command decided whether or not your radar is always centered to your location. Turning this feature off can be useful, as when you're by the edge of the map less of the radar's space is taken up by empty space, meaning you can see your surroundings more clearly.
cl_radar_rotate cl_radar_rotate [0 / 1] This command toggles whether or not your radar rotates as you rotate and look around with your camera. Some players find disabling this feature makes it easier to use the radar.
cl_hud_playercount_pos cl_hud_playercount_pos [0 / 1] Use this command to adjust where the player count (players who are in the server) menu is shown on your HUD. This also changes where the scoreboard is, that shows rounds won by each team. You can place it at the top of your screen or at the bottom.
cl_radar_icon_scale_min cl_radar_icon_scale_min [Icon Scale] This console command changes how large your character dot appears on the radar.
net_graph net_graph [0 / 1 / 2 / 3] This command will enable (set to 1) and disable (set to 0) the net graph display, which shows ping, FPS and other client variables.
+cl_show_team_equipment +cl_show_team_equipment This command puts the names of your teammates and the equipment they're carrying above their head permanently (usually just shows at the start of the round). Use -cl_show_team_equipment to disable.
cl_hud_healthammo_style cl_hud_healthammo_style [0 / 1] This command is used to toggle between whether or not you want your health & armor bars at the bottom of your screen to show their numeric value (e.g 80 health) and a bar to represent this, or just show the number.
+showscores +showscores This command will make the in game scoreboard appear. Unlike holding TAB, it will stay on your screen without you needing to press anything. Disable it with the -showscores command.
-showscores -showscores This command dismisses the scoreboard if you've brought up it permanently through a command like +showscores or +score.
cl_hud_background_alpha cl_hud_background_alpha [Alpha Value] This console command adjusts how transparent some areas of your HUD (heads up display) appear on your screen. An example of this is how visible the shaded box is behind your current amount of money to the left of your screen.
cl_hud_bomb_under_radar cl_hud_bomb_under_radar [0 / 1] This command toggles whether or not your HUD (heads up display) includes the image of a bomb underneath your radar whenever you are carrying the bomb.
cl_drawhud cl_drawhud [0 / 1] This command can be used to completely hide all features of your HUD (heads up display) or to enable them to show again.
cl_radar_square_with_scoreboard cl_radar_square_with_scoreboard [0 / 1] This command decided whether the radar is a square or a circle whenever you toggle the scoreboard open.
cl_reload_hud cl_reload_hud This command is used to reset the HUD scale back to default, and tweaks the border settings back to their original value.
cl_teamid_overhead cl_teamid_overhead [0 / 1] This command is used to display the Team ID over the heads over teammates.
cl_teamid_overhead_maxdist cl_teamid_overhead_maxdist [Max Distance] This console command sets the max distance that you will be able to see the icons above teammate's heads if team ID overhead is turned on.
cl_teamid_overhead_maxdist_spec cl_teamid_overhead_maxdist_spec [Max Distance] This console command is for spectators and observers, and determines the max distance you can see team icons at.
cl_teammate_colors_show cl_teammate_colors_show [0 / 1] This command is used in competitive games, and you can set it so that players on your team have different colors on the radar and scoreboard (default) or you can turn it off.
drawoverviewmap drawoverviewmap This command will show the overview map, if not already open. The overviewmap is the map that is shown when you are spectating (usually the CTRL key). Use hideoverviewmap to hide the map.
drawradar drawradar This command does not work since the introduction of Panorama. Previously, it would draw your radar on the screen when it was disabled. Use the cl_drawhud_force_radar -1 command to hide your radar and cl_drawhud_force_radar 1 command to show your radar.
fadein fadein [Duration] [R G B] This command will fade your client in. You can optionally specify a duration (seconds) and an RGB value for the color of the screen it fades in from.
fadeout fadeout [Duration] [R G B] This command will fade your client out. You can optionally specify a duration (seconds) and an RGB value for the color of the screen it fades out to.
gameui_activate gameui_activate This command shows the game UI (pause menu).
gameui_hide gameui_hide This command will close the game UI (pause menu), provided it is open.
hideconsole hideconsole This command will hide the console (same as pressing the console key again).
hidehud hidehud [0 / -1] This command, if set to 1 (default) will show the game's HUD. If set to -1, the game's HUD will be hidden.
hideoverviewmap hideoverviewmap This command will hide the overviewmap (if open) that shows when you are spectating.
hidepanel hidepanel [Viewport Panel] This command will hide the specified viewport panel.
hideradar hideradar This command does not work since the introduction of Panorama. Instead, use the cl_drawhud_force_radar -1 command to hide your radar and cl_drawhud_force_radar 1 command to show your radar.
hidescores hidescores This command should hide the score panel but may not work. Use -showscores to hide the scoreboard instead if this is the case.
hud_reloadscheme hud_reloadscheme This command will reload your HUD, meaning any changes you made to HUD config files would be applied.
hud_scaling hud_scaling [0.5 - 0.95] This command can be used to scale the size of the HUD. Scale must be be between 0.5 and 0.95. Default is 0.85.
hud_showtargetid hud_showtargetid [0 / 1] This command can enable or disable the red text with an enemy's that appears when you hover over an enemy. Default is enabled (1).
hud_subtitles hud_subtitles [File Name] This command will play the subtitles in the specified file.
hud_takesshots hud_takesshots [0 / 1] This command can be used to enable the auto-taking of a screenshot at the end of a match (when the scoreboard is up). Default is 0 (disabled).
net_graphheight net_graphheight [Pixels] This command sets the height of the net graph display in pixels. This is the amount of pixels it will be from the bottom of the screen. Default is 64.
net_graphmsecs net_graphmsecs [Milliseconds] This command sets the amount of seconds that the latency graph should represent. Default is 400.
net_graphpos net_graphpos [Position #] This command sets the position of the screen the netgraph display is placed at. Default is position 1 (right corner). Left corner is 0. Middle is 2.
net_graphproportionalfont net_graphproportionalfont [0 / 1] This command sets whether or not net graph font should be made proportional. Default is 1 (enabled).
net_graphshowinterp net_graphshowinterp [0 / 1] This command sets whether or not interpolation should be shown in net_graph (when on a setting above net_graph 1).
net_graphshowlatency net_graphshowlatency [0 / 1] This command sets whether or not latency should be shown in net_graph (when on a setting above net_graph 1).
net_graphshowsvframerate net_graphshowsvframerate [0 / 1] This command, if set to 1, will draw the server framerate graph. Default is 0 (disabled).
net_graphsolid net_graphsolid [0 / 1] This command sets whether or not the net graph display is solid. Default is enabled (1).
net_graphtext net_graphtext [0 / 1] The command sets whether or not the text fields like FPS, etc should be drawn in net_graph. Default is 1 (enabled).
showconsole showconsole This command opens the console.
cl_drawhud_force_deathnotices cl_drawhud_force_deathnotices [-1 / 0 / 1] This command sets circumstances under which deathnotices should be drawn (deathnotices is another word for kill feed that appears in the top right). See argument information for help.
cl_drawhud_force_radar cl_drawhud_force_radar [-1 / 0 / 1] This command sets the circumstances under which the radar is is displayed. See argument information for help.
cl_drawhud_force_teamid_overhead cl_drawhud_force_teamid_overhead [-1 / 0 / 1] This command sets the circumstances under which the "team ID" is drawn over your teammates heads (this is their name, weapons they're holding, etc). See argument information for help.
cl_spec_swapplayersides cl_spec_swapplayersides This command, if set to 1, will swap the player names and team names to the other side of the screen for spectators. Default is set to 0 (normal side).
mapoverview_icon_scale mapoverview_icon_scale [Multiplier] This command sets the scale multiplier for icons on the overview map (that spectators can open usually by pressing CTRL). If set to 2, icons would be 2x the size they usually are on the overview map. Default is 1.
r_drawmodelnames r_drawmodelnames [0 / 1] This command, if set to 1, will draw the names of the models of entities in the game (e.g. guns on the floor, etc).
enable_debug_overlays enable_debug_overlays [0 / 1] This command will enable (if set to 1) the rendering of debug overlays. If set to 0, this command will disable the rendering of debug overlays.