Core Features

• Cross-platform support (via .net core and some open src gui projects the c# team introduced me to in chat)
• compiler
• Syntax highlighting
• intellisense
• write-time error handling
• Runtime error logging
• Regex for search/replace
• WYSIWYG editors for xaml, html, xml/xsd/xlt/xls, winforms (the web pack would include the web stuff)
• Tidy support for code
• Code folding
• Standard theme available in light, dark, and high-contrast
• Built in Git/Hg/Svn support out-of-box
• Tabs AND multiple window instances
• Multi-screen support
• Basic layout manager
• Engine to support adding your own custom languages, syntax highlights, compilers, etc

Built-In Languages and Packs

Built-In Languages - Out-of-Box

• c#
• vb.net
• c++
• python

Web-pack:

• PHP + top 5 MVC/Templating Frameworks
• Ruby + Ruby-on-rails
• ASP.NET (CORE and .NET FWK)

Additional functional features

...for down the road after a minimally viable product is available, including possible features such as:

• Multi compiler/highlighter/intellisense support (think PHP, and other web scripting languages that need to support multiple languages at once like js, css, html, & your server side script lingo of choice)
• IDE theme builder
• IDE script/macro/plugin system
• Support for the config that enforces code rules across different entities and IDEs
• Ability to add new GUI elements via custom plugins (like WYSIWYG views, code-trees, etc)
• Support for screen readers on windows and popular linux (no mac to test popular any mac screen readers)
• A mobile friendly version that can sync with your computer