My buddy and I went pretty hard into GTA:SA iOS when it hit. He was using a hacked save-file in order to obtain unlimited money in the game, while I was not.
Of course, I eventually became jealous and utilized existing documentation of GTA:SA save files to manipulate my game file on-demand.
The software is available online at: http://srolfe.github.io/GTA-SA-CheatUI/
Node.JS
The software was originally created on Node.JS. When my friend saw it, he wondered how he'd be able to utilize the command-line software. Which gave me the original idea to begin creating a web-app-like interface for it.
HTML5
After creating the web-app, I had the realization that I could make this software front-end only, requiring no backend for manipulation. Thanks to Browserify, I was able to port the software to the client-side with buffer support. And with HTML5's FileSaving features, I can present the file for automatic download after the user has manipulated their save file.
The MIT License (MIT)
Copyright (c) 2014 Steve Rolfe
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.