This is a basic (kind of) SQL based gang system.
You can choose to use MySQL or SQLite as storage method in connection.lua.

[-] Features:

Creating gangs
- Custom color
- Custom tag (currently useless, up to you to do something with it)
- Bank
- Message of the day (motd)
- Logs
Member system
- Inviting
- Kicking
- Ranks
- Shouts
- Give leadership
Bank system
- Deposit
- Withdraw
Rank system
- Creating ranks
- Custom privileges per rank
- Renaming/changing privileges of existing ranks

[-] Exported functions:

addGang <-- Arguments: name, leader, color (table), tag. Returns: true or false. -->
removeGang <-- Arguments: gangName. Returns: true or false. -->
doesGangExist <-- Arguments: gangName. Returns: true or false. -->
getGangList <-- Arguments: SQL (true/false). Returns: A table with gang list. If SQL argument is used, it'll return it with gang name as index -->
getGangData <-- Arguments: gangName, dataName (leader, bank, motd, color, tag, members, createdOn, logs (table), ranks(table)). Returns: The data. -->
setGangData <-- Arguments: gangName, dataName (Can be a table), dataValue (Can be a table). Returns: true or false. -->
getGangMembers <-- Arguments: gangName. Returns: A table with gang members. -->
addGangMember <-- Arguments: gangName, accountName, rank, addedBy. Returns: true or false (if false, it'll return a second argument with the error.) -->
removeGangMember <-- Arguments: gangName, accountName, kickerName (if used it'll output who kicked the member, else it'll output that you left). Returns: true or false (if false, it'll return a second argument with the error.) -->
getMemberData <-- Arguments: gangName, accountName, dataName (gangName, account, rank, nick, lastAction, addedBy, joinedOn). Returns: The data. -->
setMemberData <-- Arguments: gangName, accountName, dataName (Can be a table), dataValue (Can be a table). Returns: true or false. -->
getAccountGang <-- Arguments: accountName. Returns: The gang name and rank, false otherwise. -->
getPlayerGangInvitation <-- Arguments: thePlayer. Returns: table. -->
getPlayersByGang <-- Arguments: gangName. Returns: A table with online gang members. -->
getPlayerGang <-- Arguments: thePlayer. Returns: The gang name, 'None' otherwise. -->
getPlayerGangRank !-- Arguments: thePlayer. Returns: The gang rank, 'None' otherwise. -->
addGangLogMessage <-- Arguments: gangName, message. Returns: true or false. -->
clearGangLogMessages <-- Arguments: gangName. Returns: true or false. -->
addGangRank <-- Arguments: gangName, rankName, privileges (table). Returns: true or false. -->
removeGangRank <-- Arguments: gangName, rankName. Returns: true or false. -->
doesRankExist <-- Arguments: gangName, rankName. Returns: true or false. -->
isRankAllowedTo <-- Arguments: gangName, rankName, action (kick, invite, log, setrank, motd, tag, color, bank_withdraw, clearlog, createrank, editrank, delrank, shout). Returns: true or false. -->

[-] How to use it:

U (default bind) - Gang Control Panel.
/gangs (default cmd) - Shows a list of all gangs.
/creategang (default cmd) <gang name> -- To create a gang
/gc (default cmd) <text> -- Gang chat
/gshout (default cmd) <text> -- Global gang shout
/accept (default cmd) -- To accept gang invitations

Example: /creategang Test

The resource comes with plenty of settings, so you can customize it at will....

(more)