Since we're in the business of software, I thought it might be appropriate to share the software (free and commercial) that we rely on to build and support our maps:
Text Editor - Notepad++
This free text editor includes features like auto complete, search using regular expressions, syntax highlighting, multiple views and more! I use a customized theme with a dark background, and soft colors to give my eyes a much needed break.
The source code for our maps is minimized for speed and obfuscated for security reasons. After trying a number of free products, I got the best results with this commercial tool.
Form Builder/Form Hosting - FormDen
This SAAS tool is owned by the Simplemaps parent company. It includes a drag-and-drop form builder that makes it simple to customize your own HTML form. It's built on top of the Bootstrap CSS library and makes it easy to create beautiful fully-customizable forms.
Cross-Browser Testing - BrowserStack
This SAAS fires up a virtual server with the operating system and browser of your choice. This makes it easy to quickly test our maps on a number of different platforms. It has been an invaluable tool to isolate browser and OS specific bugs in our maps.
SVG Editing - Inkscape
Screencasts - Screencast-O-Matic
There are a lot of tools in this space, but I use the downloaded version of this commercial software for my tutorials and screencasts. It is intuitive and makes it easy to upload the videos quickly to YouTube, Vimeo, or other sites.
Online Spreadsheet - Handsontable
This open source Excel-like data grid powers our online customization tools. It has great documentation and I am very thankful for it!