A Roblox script builder or SB is a game where the player can run code inside of it. This is a place for basic to very advanced scripters. Script builders are [a com]mon hangout for scripters. Some SB's allow you to use your own scripts you made. If you don't and people see that you used a leak script or FM for short, they will call you a FMer and will probably kick/ban you. Most SB's that require you to use your own scripts have an age limit to join, usually 1 year or older to join. The most popular SB's are usually the ones that have FMers like Voidacity's Script Builder. Probably because you can use leaked scripts or FM's on it without getting banned or kicked.
Script Builders[]
Script builders are different now than they were in the past. Commands have changed and are different from previous script builders. For example, if you wanted to run a script you would use a command like so:
c/code here
Also, there is a change in commands for local scripts. They run like so:
l/code here
You can also run code using 
HttpService. Here is an example on how to run a server-sided script:
Server Side Script Builder Tutorial
h/url here
You can also run locals similarly:
hl/url here
please take note that the commands above are only for voidacity script builder
The most common way to store code for use in a script builder is using a paste site, for example Pastebin.
New script builders have what's called a sandbox. A sandbox is an environment made to execute unsigned code, meaning user generated code. If you try to kick a player, the sandbox blocks the kick. A sandbox is a very important and a part of modern-day script builders.
A script builder sandbox isn't perfect, as there are many people creating what are called bypasses. Bypasses allow the user to execute code outside the sandbox, allowing things such as kicking a player. Bypasses are usually made by advanced scripters and are usually kept a secret.
A breakout is a piece of code that allows access to the main environment, which means a user can access code that is ran in the game by intercepting commands such as "h/" or "hl/", allowing the user to see their code when the code is ran.
Although, sandboxes may have their weaknesses it is not very complex to fix those vulnerabilities, if the creator of the sandbox knows what he's doing.
Update: Many script builders are being required to filter interfaces made by other people. This means having a script that looks for messages, hints, and anything in a graphical user interface to ensure that it is filtered so that the game follows the Roblox community guidelines
What Happened to the Old Script Builders?[]
The old script builders used loadstring, which is disabled by default. Client-sided loadstring is not allowed, but server-sided loadstring is. That is why the old script builders will never work again. Anaminus's script builder was open source, until its closure in 2014, the year that Roblox patched loadstring. Ever since there have been countless users creating new script builders using Anaminus' code, which doesn't work, even though they claim client-sided loadstring works.
The FE transition[]
For a while, Roblox has been planning on transitioning games from the classic client/server model to a new model called "Filtering Enabled". This new model limits client sided code by not allowing changes to replicate to the server. This deems LocalScripts limited to UI/Input related functionalities. Since a lot of scripts developed for Script Builder specificially depended on the classic replication, this change rendered them useless. However, tusKOr661 has been moving to have Void SB be able to handle this change, and incorporate filtering enabled into client sided scripts. While this is still a work in progress, the community itself has stepped in to make some scripts FE compatible. However, many of the script builders could not handle this, rendering them useless. Roblox as of recently, has forced filtering onto every game.
Known Script Builders[]
Working[]
Script Builders listed here are known to be functional, and can be actively played as of the last edit.
Anti's Script Builder[]
Originally made in 1/22/2010, AntiBoomz0r's take is an unsandboxed Script Builder. Anti didn't want to sandbox his spin of Script Builder to stay as true to Roblox Lua as possible, which resulted in the game being shutdown several different times and moderation action taken on AntiBoomz0r's account for ToU violations. This caused the game to be temporarily shutdown, and eventually migrated to different locations while a solution was made. When Third Party Private Modules were still around, it ended up being a Member Only game for The Bleu Pigs - Elite Scripters (Now rebranded as Bleu Pigs - Scripters). When Experimental Mode and Third Party Private Modules were removed, Anti's was once again discontinued for about a year and a half, until it was moved over to Anti's alt PotatoWeb living under the name PotatoSB, which is no longer active. Despite no longer being directly under the Bleu Pigs group, it's community is still heavily involved with Bleu Pigs, including cross chat where in-game users and members of the Bleu Pigs Discord was able to communicate with each other.
Regarding "Anti-FM" stance[]
Anti's Script Builder had one standing rule throughout all of its variants: Do not run Scripts you didn't make. This caused some to believe the community involved within Anti's to be elitists who thought they were better than those who didn't know how to Script, the actuality was most of those who were banned either didn't want to learn Roblox Lua or were attempting to steal code made by the community.
- Anti's Testing Group (DYSFUNCT)
- The Bleu Pigs - Elite Scripters #1 (DYSFUNCT)
- The Bleu Pigs - Elite Scripters #2 (DYSFUNCT)
- Elite Scripters #3 (DYSFUNCT)
- PotatoSB - part of Bleu Pigs (CURRENT)
Voidacity Script Builder (Formerly oxcool1's Script Builder)[]
Originally made in 1/5/2010, Voidacity Script Builder (known as oxcool1's Script Builder at the time) is a sandboxed Lua environment which restricts access to certain Objects and APIs, specifically restricting the ability to disconnect Players from the game or teleport them to another game. Voidacity also employs volunteer moderators, in attempt to keep the game ToU compliant. When Anaminus's Script Builder was discontinued in 2014, oxcool1's shortly became the go to for Players who wanted to run "free models". In 2016, a second version of the game was introduced, dubbed Place 2. Place 2 was intended to be a more lax environment for those who wanted to test their creations and hang out in Place 1, allowing for certain types of abuse which was restricted in Place 1. Between 2014 and 2017, Place 1 would bolster an average of 25-200 Players, with Place 2 averaging 75 - 200 Players once introduced in 2016, with Summer break contributing toward the higher ranges. This could be considered the peak of Script Builder as of its current history. Similar to Anti's, Voiliax would experience moderation against his account for various ToU violations, and on 5/28/2017, decided to shutdown the original Place 1/2, and migrate the games to the Void Community group. During July 2017, Roblox began making changes to Filtering Enabled, ultimately ending with Experimental Mode being removed in June 2018. This led to a major decrease in activity across many Script Builders, but Voidacity taking the biggest hit. It was also around 2018 when Voiliax transferred ownership to tusKOr661, who started helping Voiliax around mid 2017.
- Void Community - Place 1 (CURRENT)
- Void Community - Place 2 (CURRENT)
Obama Script Builder/Bleu Pigs - Scripters[]
Research pending
Bleu Pigs - Scripters (CURRENT)
MasterKelvinVIP's Script Builder[]
Research pending
Project Luna's Script Builder[]
Research pending
maumaumaumaumaumau's Script Builder[]
Originally made 5/21/2018, a lot isn't known about maumaumaumaumaumau's Script Builder other than it's relatively new, and is sandboxed. As more information surfaces, this subsection will be updated accordingly.
maumaumaumaumaumau's Script Builder
Dark Eccentric's Script Builder[]
A script builder made by Dark Eccentric, a popular YouTuber prominent for showcasing a multitude of scripts. Dark Eccentric's Script Builder
Dysfunct[]
Script Builders listed here are known to be broken, and are referenced for historic purposes. Although some may be playable, do not expect intended functionality.
Elttob's Script Builder[]
Research pending