Kit PvP Signs in Vanilla Minecraft Commands for Minecraft 1.9 (v3):
https://www.youtube.com/watch?v=Nngs_4Sk8Iw
https://www.youtube.com/c/SamTheSheep
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►Player Tag Sign:
This command tags a player who clicks the sign.
(Ex. After giving player the 'archer' tag, run all commands using the selector @a[tag=archer])

/blockdata ~ ~1 ~ {Text1:"[{\"text\":\"[Kit PvP]\",\"color\":\"dark_red\",\"bold\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/scoreboard players tag @p add archer\"}}]",Text2:"[{\"text\":\"Click to get\",\"color\":\"yellow\",\"bold\":true}]",Text3:"[{\"text\":\"Archer Kit\",\"color\":\"yellow\",\"bold\":true}]",Text4:"[{\"text\":\"---------------\",\"color\":\"dark_red\",\"bold\":true}]"}

Example Command:
/replaceitem entity @a[tag=archer] slot.hotbar.0 bow 1 0 {ench:[{id:48,lvl:1}]}
Gives player who clicks the sign a bow in their first inventory slot.

►Archer Kit Sign Compact Commands (No Command Blocks)
These are the four commands that are used as clickEvents inside the sign. Signs can only run up to 4 commands.

/clear @p
Clears the player's inventory to get a new kit each time

execute @p ~ ~ ~ /summon Item ~ ~ ~ {Item:{id:bow,Count:1,tag:{ench:[{id:48,lvl:1}]}},Passengers:[{id:Item,Item:{id:golden_sword,Count:1},Passengers:[{id:Item,Item:{id:cooked_beef,Count:16},Passengers:[{id:Item,Item:{id:arrow,Count:64},Passengers:[{id:Item,Item:{id:arrow,Count:64},Passengers:[{id:Item,Item:{id:golden_helmet,Count:1},Passengers:[{id:Item,Item:{id:golden_chestplate,Count:1},Passengers:[{id:Item,Item:{id:golden_leggings,Count:1},Passengers:[{id:Item,Item:{id:golden_boots,Count:1}}]}]}]}]}]}]}]}]}
Gives kit items directly to the player. By summoning items riding other items, you can give yourself multiple items through one command block! Created using: http://mcstacker.bimbimma.com/

/playsound entity.experience_orb.pickup master @p ~ ~ ~ 1 1
Plays ding sound when sign is clicked.

/tellraw @p [\\\"\\\",{\\\"text\\\":\\\"[Kit PvP] \\\",\\\"bold\\\":true,\\\"color\\\":\\\"dark_red\\\"},{\\\"text\\\":\\\"You have selected the \\\",\\\"color\\\":\\\"yellow\\\"},{\\\"text\\\":\\\"Archer \\\",\\\"bold\\\":true,\\\"color\\\":\\\"red\\\"},{\\\"text\\\":\\\"kit!\\\",\\\"color\\\":\\\"yellow\\\"}]
Says a message in chat telling you which kit you have selected.

Together, these commands create this sign (blockdata):
/blockdata ~ ~1 ~ {Text1:"[{\"text\":\"[Kit PvP]\",\"color\":\"dark_red\",\"bold\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/clear @p\"}}]",Text2:"[{\"text\":\"Click to get\",\"color\":\"yellow\",\"bold\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"execute @p ~ ~ ~ /summon Item ~ ~ ~ {Item:{id:bow,Count:1,tag:{ench:[{id:48,lvl:1}]}},Passengers:[{id:Item,Item:{id:golden_sword,Count:1},Passengers:[{id:Item,Item:{id:cooked_beef,Count:16},Passengers:[{id:Item,Item:{id:arrow,Count:64},Passengers:[{id:Item,Item:{id:arrow,Count:64},Passengers:[{id:Item,Item:{id:golden_helmet,Count:1},Passengers:[{id:Item,Item:{id:golden_chestplate,Count:1},Passengers:[{id:Item,Item:{id:golden_leggings,Count:1},Passengers:[{id:Item,Item:{id:golden_boots,Count:1}}]}]}]}]}]}]}]}]}\"}}]",Text3:"[{\"text\":\"Archer Kit\",\"color\":\"yellow\",\"bold\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/playsound entity.experience_orb.pickup master @p ~ ~ ~ 1 1\"}}]",Text4:"[{\"text\":\"------------\",\"color\":\"dark_red\",\"bold\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/tellraw @p [\\\"\\\",{\\\"text\\\":\\\"[Kit PvP] \\\",\\\"bold\\\":true,\\\"color\\\":\\\"dark_red\\\"},{\\\"text\\\":\\\"You have selected the \\\",\\\"color\\\":\\\"yellow\\\"},{\\\"text\\\":\\\"Archer \\\",\\\"bold\\\":true,\\\"color\\\":\\\"red\\\"},{\\\"text\\\":\\\"kit!\\\",\\\"color\\\":\\\"yellow\\\"}]\"}}]"}

Download world from video description for other kits.