DT PS Tree shows running processes as a tree. It is a reimplementation of pstree from PSmisc for FreeBSD, NetBSD, OpenBSD, DragonFly BSD, and possibly other modern BSD variants. It also works without /proc and will show the full set of processes in a jail even if init is not present.
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At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.