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There is also

• dpipe, the "bi-directional pipe", included in vde2 package, and included in current distro package management systems.

  dpipe processA = processB

• socat, the connect everything-to-everthing tool.

  socat EXEC:Program1 EXEC:Program2

As @StéphaneChazelas correctly notes in the comments, above examples are the "base form", he has nice examples with options on his answer for a similar question.

There is also

• dpipe, the "bi-directional pipe", included in vde2 package, and included in current distro package management systems.

  dpipe processA = processB

• socat, the connect everything-to-everthing tool.

  socat EXEC:Program1 EXEC:Program2

As @StéphaneChazelas correctly notes in the comments, above examples are the "base form", he has nice examples with options on his answer for a similar question.

There is also

• dpipe, the "bi-directional pipe", included in vde2 package, and included in current distro package management systems.

  dpipe processA = processB

• socat, the connect everything-to-everthing tool.

  socat EXEC:Program1 EXEC:Program2

There is also

• dpipe, the "bi-directional pipe", included in vde2 package, and included in current distro package management systems.

  dpipe processA = processB

• socat, the connect everything-to-everthing tool.

  socat EXEC:Program1 EXEC:Program2

As @StéphaneChazelas correctly notes in the comments, above examples are the "base form", he has nice examples with options on his answer for a similar question.

There is also dpipe, the "bi-directional pipe", included in vde2 package, and included in current distro package management systems.

http://manpages.ubuntu.com/manpages/trusty/man1/dpipe.1.html

dpipe processA = processB

There is also

• dpipe, the "bi-directional pipe", included in vde2 package, and included in current distro package management systems.

  dpipe processA = processB

• socat, the connect everything-to-everthing tool.

  socat EXEC:Program1 EXEC:Program2