Features not yet implemented include signal subtraction, two-pass decoding, and use of "a priori" (already known) information as it accumulates during a QSO." In 2019, Taylor, et al, introduced FT4, an experimental protocol which is similar to FT8 but has a shorter T/R sequence length for faster contest exchanges. There are alternative software packages available for JT65 including MultiPSK (a commercial package developed by F6CTE), and JT65-HF HB9HQX Edition (a free software package forked from the JT65-HF project developed by W6CQZ). The JT65-HF HB9HQX Edition software, along with the source code, may be obtained from Sourceforge. An article series on using the original JT65-HF software appeared in CQ Amateur Radio's October & November 2010 issues. And MSHV  from LZ2HV recompiled from source code of WSJT-X with different GUI implementation both for Linux and Windows OS.