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Replacement for GPL/GNU tools.

Major libraries:

• glibc: musl libc (could be relicensed)
• libstdc++: libc++
• libsupc++: libcxxrt
• libgcc: compiler-rt
• libgcc_s: libunwind

Basic utilities:

• binutils: elftoolchain
• groff: mdocml
• coreutils: toybox
• gcc/g++: clang/llvm

Other stuff (not such important, some of this should be in toybox at some point):

• make: bmake (not 100% compatible)
• bison: byacc
• bash: mksh (modern small ksh)
• gawk: nawk (one true awk)
• readline: libedit