JavE might be a bit more popular than UMLet. We know about 1 link to it since March 2021 and only 1 link to UMLet. 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.
I like Umlet. It is a GUI drawing tool, but is not overbearing. Since I like to abuse the details of UML graphical notation, Umlet lets me type anything in a class "box" I like. Source: about 1 year 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
draw.io - Online diagramming application
asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
StarUML - StarUML
Playscii - Full-featured ASCII art and graphic editor and game creation tool
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
PabloDraw - PabloDraw is an Ansi/Ascii text and RIPscrip vector graphic art editor/viewer with multi-user capabilities.