There are many alternatives to Dia for Linux if you are looking for a replacement. The best Linux alternative is diagrams.net, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Dia and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Dia are yEd Graph Editor (Free), LibreOffice - Draw (Free, Open Source), TreeSheets (Free, Open Source) and PlantUML (Free, Open Source).
Umbrello is a Unified Modelling Language (UML) modelling tool and code generator. It can create diagrams of software and other systems in the industry-standard UML format, and can also generate code from UML diagrams in a variety of programming languages.
Xfig is an interactive drawing tool which runs under X Window System Version 11 Release 4 (X11R4) or later, on most UNIX-compatible platforms, and e.g. under Darwin on the MacIntosh and any X server under Microsoft Windows.
Heimer is a desktop application for creating mind maps and other suitable diagrams. It's written in Qt and targeted for Linux and Windows. Features: Easy-to-use UI Very fast Zoom in/out/fit Zoom with mouse wheel Save/load in XML-based .
Oracle SQL Developer Data Modeler is a free graphical tool that simplifies data modeling tasks. Using Oracle SQL Developer Data Modeler users can create, browse and edit, logical, relational, physical, multi-dimensional, and data type models.
An online diagramming tool with built-in productivity features to create diagrams faster. Draw flowcharts, mind maps, org charts, network diagrams, Venn diagrams and 50+ other diagrams types. Readymade templates to get started fast.
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Creately vs Dia opinions
pros, cons and recent comments
Support almost every diagram type of DIA and much better user interface and templates