ObservePoint Alternatives

UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.

yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.

RealityMAX is the most powerful free 3D design collaboration platform, 100% online. Cooperate remotely with your colleagues on 3D projects and easily share your work with clients. Create Web3D and AR experiences in a snap, without a line of code.

Visit website freemium $40.0 / Monthly (Pro with up to 500 GB of storage space)

Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.

Online diagramming application

Open Source

OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.

StarUML

ArgoUML, free and safe download. ArgoUML latest version: Open-source diagramming application for personal computers. ArgoUML is a program that allows users to create complex and professional diagrams.

LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.

UMLet - Free UML Tool for Fast UML Diagrams

Gaphor is a Python-based, open source, multiplatform and multipurpose modeling application for creating nice UML diagrams for documentation.

Visualize, design, innovate. The ultimate diagramming and modeling suite for UML, ERD, BPMN, flowcharting and data architecture. Elevate your ideas to new heights.

freemium €59.0 / One-off (Standard Edition)

NClass is a free tool to easily create UML class diagrams with full C# and Java language support.

PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.

Open Source