JavE might be a bit more popular than BOUML. We know about 1 link to it since March 2021 and only 1 link to BOUML. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Markdeep[0] from Casual Effects has a way of drawing diagrams using extended markdown. I used it to write this document with two diagrams: https://loan-free-ed.neocities.org Other tool I like are PlanetUML[1], BoUML[2] and Modellio[3](it is very heavy though on system resources!) [0] https://casual-effects.com/markdeep [1] https://plantuml.com [2] https://bouml.fr [3] https://www.modelio.org. - Source: Hacker News / about 3 years ago
I use JAVE. It's not the best, but it's good for tracing pictures since it has a watermark feature. Source: almost 3 years ago
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Playscii - Full-featured ASCII art and graphic editor and game creation tool
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
PabloDraw - PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.