Top Alternatives to Cacoo

Lucidchart is a web-based application to draw diagrams.

draw.io is free online diagram software for making flowcharts, process diagrams, etc

Dia is free and open source drawing software.

yEd is a free general-purpose diagramming program with a multi-document interface.

Microsoft Visio (formerly Microsoft Office Visio) is a diagramming and vector graphics application and is part of the Microsoft Office family.

LibreOffice is a full-featured office productivity suite that provides a near drop-in replacement for Microsoft Office.

Freeplane is a free, open source software application for creating mind maps and electronic outlines.

Creately is a collaborative diagramming and design software used by teams around the world to communicate more effectively.

PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language.

Google Drawings is a free, web-based diagramming software developed by Google.

Gliffy is software for diagramming via a HTML5 cloud-based app. It is used to create UML diagrams, floor plans, Venn diagrams, flowcharts and various other kinds of diagrams online.

MindNode makes mind mapping delightful.

Edraw Max is comprehensive mind mapping and planning tool network diagrams, floor plans, workflow diagrams, business charts, and engineering diagrams.

SpiderScribe.net is an online mind mapping and brainstorming tool. It lets you organize your ideas by connecting notes, files, calendar events, etc. in free-form maps.

Coggle is a freeware mind-mapping web application. Like other mind-mapping software, Coggle produces hierarchically structured documents, like a branching tree. This contrasts with conventional collaborative editors, like Google Docs, which provide either linear (text document), or tabular (spreadsheet) document formats.

Diagramo is an online flowchart software. It's FREE and Open Source ( GPL ) It's pure HTML5 Share and collaborate.

bubbl.us is a mind map tool. It's a visual thinking tool for structuring information, helping you to better understand, remember and generate new ideas.

MockFlow is a collection of wireframe tools, prototyping tools, UI mockups, UX suite.

VisiTouch helps you view and convert to PDF your MS Visio diagrams for iPhone.

ProcessMaker is an Open source web-based workflow software and Business Process Management software.

Nevron Draw is a software for creating flowcharts and diagrams.

Diagrammix is a tool for efficiently building attractive diagrams and flowcharts.

Mockup Designer is an online mockup creator.