Embedded GLIBC (EGLIBC) was a variant of the GNU C Library (GLIBC) that wass designed to work well on embedded systems. EGLIBC strived to be source and binary compatible with GLIBC. EGLIBC's goals included reduced footprint, configurable components, better support for cross-compilation and cross-testing.
EGLIBC is no longer developed and such goals are now being addressed directly in GLIBC.
Recent developments include:
A primary feature of EGLIBC is support for configurability. You can build EGLIBC without support for NIS, locales, or other things that you may not need in your embedded system. The options.def file in the source tree has a list of the various components that have already been implemented. The original design explains more about the EGLIBC component system. The features page describes other features of EGLIBC.