An effective alternative to Emacs for developing in Scheme is Sublime Text. It provides excellent syntax highlighting and formatting, easy-to-use integration with Gambit's REPL and is very fast.
These brief instructions assume you are familiar with Sublime Text and have installed its package manager. Setup for Gambit development only involves plugins that are installed with Sublime Text's package manager. These instructions use menu commands, but there are equivalent key mappings if you are already a Sublime Text user. The Package Manager relies on an internet connection to download packages.
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First, install Scheme language support. Choose Tools / Command Palette... Type Pkg and you will see a list of commands for the Package Manager. Use down arrow to highlight Package Control: Install Package. Begin typing Scheme--very quickly the package for Scheme Syntax will be listed. Down-arrow to highlight it and press enter. It will be installed.
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Second, install Sublimerepl. Choose Tools / Command Palette..