Kwaak3-cc is a project mainly written in C and ASSEMBLY, it's free.
To buildz:
SRC:
(tld)$ cd ioquake
(ioquake)$ make ANDROID_NDK_DIR=
JNI:
(ndk)$ ./ndk-build -C
SDK one-time setup:
(sdk)$ tools/android update project --path
JAVA:
(tld)$ cd kwaak/project
(project)$ ant release
(project)$ jarsigner -keystore