std
This plugins gets packed with your binary by default and provides standard Linux system calls, strings functions and printf-like priting helper.
fds
This one allows you to send and receive fds in parasite to/from the master process.
shmem
This one sets up shared memory between parasite and master.
argv
Provides calls to unpack void *arg, unsigned arg_size blob into int argc, char **argv passed by compel tool.