Use "freecolor" to display memory and swap usage

Freecolor on FreeBSD is equal to free on GNU/Linux. Install it:

# cd /usr/ports/sysutils/freecolor
# make install clean 

Display the memory and swap usage in bar format:

# freecolor
Physical  : [#################################..] 94%   (1907820/2018396)
Swap      : [###################################] 100%  (1048540/1048540)

Display usage in traditional "free" format:

# freecolor -m -o
             total       used       free     shared    buffers     cached
Mem:          1971        107       1863          0          0          0
Swap:         1023          0       1023

Reference:
FreeBSD find out RAM size Including Total Amount of Free and Used Memory Size.