lightweight and/or efficient library and utility alternatives

Have been trying to find some lightweight and/or efficient
alternatives to common Open Source libraries and utilities.  If anyone
knows of others they'd recommend, please let me know.  Below are some
options I've found.  If anyone's tried some of these, would be
interested to hear what you thought of them.

pkgconf
https://github.com/nenolod/pkgconf
tinygettext
http://code.google.com/p/tinygettext/
libintl-lite
http://sourceforge.net/projects/libintl-lite/
TinyGL
http://sourceforge.net/projects/sdl-tinygl/
minised
http://www.exactcode.de/site/open_source/minised/
nmh
http://www.nongnu.org/nmh/
sha1sum
http://lists.gnupg.org/pipermail/gnupg-announce/2004q4/000184.html

I've been using pkgconf as a drop-in replacement for pkg-config.  Haven't seen
any differences in functionality and it's a nice implementation without circular
build dependencies.  I've also been using sha1sum in place of openssl sha1.

Would also be interested to hear if anyone's tried using just EGL
instead of the entire OpenGL/Mesa libraries.

Sincerely,
Laura
http://www.distasis.com/cpp
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