An cloud-based flow chart maker with a number of usual features, including integration with programs like Visio.
Cost: Free, but account required
From the website:
Easy to start
Because Lucidchart's free flowchart software runs in the cloud, there's no download or installation required, so you can use it from any device. With its simple user interface and drag-and-drop functionality, Lucidchart minimizes the learning curve.
Import Visio files (.vdx, .vsd, or .vsdx) with the click of a button. Once they're uploaded, you can view them and make your own edits with our easy-to-use tools. If your colleagues still use Visio, you can even export your original Lucidchart diagrams as Visio files!
Our diagramming software integrates with other productivity tools, including G Suite, Confluence, and Jira Software, so you can work more efficiently than ever. You can also pull content for your diagrams from sources like YouTube, Dropbox, and Facebook.
Publish and share
When it’s finished, publish your flowchart as a PDF or image and easily include it in a report, presentation, or web page. You can even embed diagrams into a webpage. Or post it directly to your favorite social media platform for some extra attention.