Software

py_trees_js

A JavaScript library and PyQt demo viewer for visualising runtime or replayed behaviour trees, with a timeline for rewinding and resuming.

Facts

GitHub stars: 24read on 6 Nov 2026
Last update: 15 Sept 2026Newest commit on devel
Maintenance: Activea commit in the last 90 days
Difficulty: Intermediate
Hardware it needs, as the project states it: With the DevContainer route, a PC with an NVIDIA GPU is used; alternatively, uv and PyQt can be installed on a system or in a venv.

Checked on GitHub on 6 Nov 2026.

Code: BSD-3-Clause (opens in a new tab)
Read by Robotheca from LICENSE (opens in a new tab) at commit ae4eaac (opens in a new tab), on 16 Oct 2026. A license text Robotheca's reader does not know: a person at Robotheca set it on 9 Nov 2026.
Commercial use: Yes

Renders the runtime state of a behaviour tree on a canvas.
Supports collapsible subtrees and zooming with scale-to-fit.
Offers timeline rewind and resume of recorded tree snapshots.
Includes a blackboard key-value view and an activity log view.
Designed for py_trees but its interfaces are not tied to py_trees.
Ships as a self-contained JavaScript library plus a Python package exposing it as a PyQt resource.

Written by Robotheca from the project's README (opens in a new tab) at commit ae4eaac, not by its creator.

Facts read at commit ae4eaac

Robotheca never hosts the code: each link goes to the creator's own page.

How to install it, in the creator's words: The project's README (opens in a new tab)

Robotheca doesn't review code. Read it before running it.

Robotheca lists software as a reference: nothing is hosted or run here, and every fact links to where it was read.