BusyBox v1.22.1-ndk16-r9 (2014-02-16 15:10:54 CST) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2012.
Licensed under GPLv2. See source distribution for detailed
copyright notices.

Usage: busybox [function [arguments]...]
   or: busybox --list[-full]
   or: busybox --install [-s] [DIR]
   or: function [arguments]...

        BusyBox is a multi-call binary that combines many common Unix
        utilities into a single executable.  Most people will create a
        link to busybox for each function they wish to use and BusyBox
        will act like whatever it was invoked as.

Currently defined functions:
        [, [[, acpid, adjtimex, ar, arp, arping, ash, awk, base64, basename, bbconfig, blkid,
        blockdev, brctl, bunzip2, bzcat, bzip2, cal, cat, catv, chattr, chgrp, chmod, chown, chpst,
        chroot, chrt, cksum, clear, cmp, comm, cp, cpio, crond, crontab, cryptpw, cut, date, dc,
        dd, depmod, devmem, df, dhcprelay, diff, dirname, dmesg, dnsd, dnsdomainname, dos2unix,
        dpkg-deb, du, dumpleases, echo, ed, egrep, eject, env, envdir, envuidgid, ether-wake,
        expand, expr, fakeidentd, false, fbset, fbsplash, fdflush, fdisk, fgrep, find, findfs,
        flash_eraseall, flash_lock, flash_unlock, flashcp, flock, fold, free, freeramdisk, fsck,
        fstrim, fsync, ftpd, ftpget, ftpput, fuser, getopt, grep, groups, gunzip, gzip, halt, hd,
        hdparm, head, hexdump, hostid, hostname, httpd, hwclock, id, ifconfig, ifdown, ifup, inetd,
        inotifyd, insmod, install, ionice, iostat, ip, ipaddr, ipcalc, ipcrm, ipcs, iplink,
        iproute, iprule, iptunnel, kill, killall, killall5, less, ln, logname, losetup, ls, lsattr,
        lsmod, lsof, lspci, lsusb, lzcat, lzma, lzop, lzopcat, makedevs, makemime, man, md5sum,
        mdev, mesg, microcom, mkdir, mkdosfs, mke2fs, mkfifo, mkfs.ext2, mkfs.vfat, mknod,
        mkpasswd, mkswap, mktemp, modinfo, modprobe, more, mount, mountpoint, mpstat, mv, nameif,
        nanddump, nandwrite, nbd-client, nc, netstat, nice, nmeter, nohup, nslookup, ntpd, od,
        patch, pgrep, pidof, ping, ping6, pipe_progress, pivot_root, pkill, pmap, popmaildir,
        poweroff, powertop, printenv, printf, ps, pscan, pstree, pwd, pwdx, raidautorun, rdev,
        readlink, readprofile, realpath, reboot, reformime, renice, reset, resize, rev, rfkill, rm,
        rmdir, rmmod, route, rpm2cpio, run-parts, runsv, runsvdir, rx, script, scriptreplay, sed,
        sendmail, seq, setconsole, setkeycodes, setlogcons, setserial, setsid, setuidgid, sh,
        sha1sum, sha256sum, sha3sum, sha512sum, showkey, slattach, sleep, smemcap, softlimit, sort,
        split, start-stop-daemon, stat, strings, stty, su, sum, sv, svlogd, swapoff, swapon,
        switch_root, sync, sysctl, tac, tail, tar, taskset, tcpsvd, tee, telnet, telnetd, test,
        tftp, tftpd, time, timeout, top, touch, tr, traceroute, traceroute6, true, ttysize, tunctl,
        tune2fs, udhcpc, udhcpc6, udhcpd, udpsvd, umount, uname, uncompress, unexpand, uniq,
        unix2dos, unlzma, unlzop, unxz, unzip, uptime, usleep, uudecode, uuencode, vconfig, vi,
        volname, watch, wc, wget, which, whoami, whois, xargs, xz, xzcat, yes, zcat, zcip

Source code Patch file for original busybox 1.22.1
Pre-built binary for ARMv7 CPU with vfpv3 (ARM) Config file Build log
Pre-built binary for ARMv7 CPU with vfpv3 (Thumb2) Config file Build log
Most patches from Tias on GitHub