umbra (plural umbras or umbrae) 1. (astronomy) The area of the earth or moon experiencing the total phase of the eclipse. [Wikimedia/Wictionary]
Umbra integrates and extends the popular Eclipse™ IDE for C/C++ Developers with a collection of proprietary and open source tools to provide a feature-rich, integrated, cross-platform development environment for source code editing, compiling, and interactive in-application/in-circuit debugging, including the Gnu Compiler Collection C and C++ compilers and binary utilities.
The open-source components include:

Umbra extends the Eclipse IDE's C Managed Build facility for cross-compilation via the Gnu cross-compilers and utilities, and automates project generation for ExedOS™ applications and operating system extensions.

Eclipse™ is a trademark of the Eclipse Foundation.
Windows® is a registered trademark of Microsoft Corp.
ExedOS™ is a trademark of Xcedent LLC.