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The only market MINIX targets is education. It's sole purpose in life is to make teaching OS internals, micro-kernel internals, and similar topics. It's small, easy-to-understand, and teachable. Nothing more.
There's virtually no software available for it.
In _theory_ MINIX should be able to run the same software as Linux or BSD if the user is willing to compile. In practice that's far from the truth. A lot of software, even trivial software, won't compile and run "as is" on MINIX. A while back I tried to port some small apps from Linux to MINIX. Eventually I got them to compile, but they wouldn't run properly. A lot of little things are different enough to make porting a hassle.
MINIX is an interesting little system, but it doesn't really offer anything over Linux or FreeBSD, except as a learning tool.