dotPeek
.NET Reflector
MonoDevelop
dnSpy
Zeta Resource Editor
CFF Explorer Suite
Telerik JustDecompile
MSIL Disassembler
Koding
Codeanywhere
AWS Cloud9
Codiad
goormIDE
PaizaCloud
SourceLair
Glitch
dotPeek.NET Reflector - .
Codeanywhere - Codeanywhere is a complete toolset for web development. Enabling you to edit, collaborate and run your projects from any device.
MonoDevelop - MonoDevelop enables developers to write desktop and web applications on Linux, Windows and Mac OS X.
AWS Cloud9 - AWS Cloud9 is a cloud-based integrated development environment (IDE) that lets you write, run, and debug your code with just a browser.
dnSpy - .NET assembly editor, decompiler, and debugger
Codiad - Codiad is an open source, web-based, cloud IDE and code editor with minimal footprint and requirements