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Web-based Development Software

Title

Description

Requirements

6502js
Emulator for assembling/disassembling 6502 ASM
JavaScript
8bitworkshop
Learn how to program for 8-bit systems/consoles using an online IDE; "write code and see it run it instantly"
JavaScript
Atari Background Builder
A playfield editor for use with batari, an easy way to create Atari 2600 games with BASIC
JavaScript
BBC BASIC for SDL
BBC BASIC for WASM
WASM
Beebasm
Emulator for assembling/disassembling 6502 ASM for BBC Microcomputers
JavaScript
Bitsy
"a little engine for little games, worlds, and stories"
JavaScript
CSS Generator
A tool to quickly generate CSS for text within a box
JavaScript
Drawio
Create diagrams online and save/export in various formats
JavaScript
Easy Game Maker
Create an HTML5 game online; reminds me of a simplified mix between microStudio and Scratch; project can be saved for later via a JSON file
JavaScript
FF6Tools
A browser-based editor utility for Final Fantasy VI (Final Fantasy 3 in USA). Current features include a map editor, battle editor, and event editor.
JavaScript
Final Fantasy IV Tweak
An online editor for Final Fantasy IV (Specifically a ROM of Final Fantasy II US v1.1). The current scope is mainly to edit commands.
JavaScript
GB64
An online Game Boy and Game Boy Color ROM to N64 ROM converter; may be useful in conjunction with GB Studio
JavaScript
GMEdit
An online, open-source code editor for Game Maker GML scripts
JavaScript
Godot v4.3 Web Editor
Create games using the Godot's online web editor (with limitations
WASM
Hasher-js
An online ROM hasher
JavaScript
Imaginary 6502 Emulator / Assembler
Assemble/disassemble 6502 ASM using JavaScript
JavaScript
jswindow
An easy way to use JavaScript to create movable windows on your web page
JavaScript
microStudio
A free game engine online; program using microScript, Lua, Python, or JavaScript
JavaScript
MyAndroid
Site includes an online Android emulator, an APK runner, and a Cordova IDE with a WYSIWYG/source toggle for HTML; no sign-up required; web browser add-ons available
JavaScript
Pyxel Web Launcher
Launcher tool for the WebAssembly (WASM) version of Pyxel, a retro game engine for Python
WASM
QBjs
An online version of QB64
JavaScript
Raverie Engine
A pure WebAssembly (WASM) based game engine/editor that aims to recreate the vibe of Flash games
WASM
Ren'Py
A free and open-source visual novel engine
HTML5 and WASM
ROM Patcher JS
Use this online tool to patch ROMs
JavaScript
Scratch
"Scratch is the world’s largest coding community for children and a coding language with a simple visual interface that allows young people to create digital stories, games, and animations"
JavaScript
SourceCoder 3
An online IDE for various TI-83/84 calculators and Casio Prizm, fx-9860, or fx-9750
JavaScript
Text Tools
A LOT of text-related tools; could be good for both documents and scripts
HTML5
TGE (Top Gear Editor)
Use this to edit "Top Gear" for the SNES
HTML5
Tiny BASIC
An online Tiny BASIC interpreter
HTML5
TurboWarp
"...the better version of Scratch with dark mode, addons, a compiler, and a lot more"; there is also a desktop version
JavaScript
Twine
Write interactive stories and presentations
JavaScript
ugBASIC
A way to test simple code meant for ugBASIC but online, though it can build; ugBASIC provides a way to create games for several 8-bit microcomputers
JavaScript
ViewJS
Use this tool to help your website visitors view Open Document Formats like ODT, ODP, and ODS and also PDF documents online
JavaScript
WebGM
Create WebAssembly (WASM) games online using a GameMaker-like interface
JavaScript/WASM
ZQuest Classic
Technically meant to play Zelda-like games; however, there is also an editor; there is also an offline editor
WASM

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