Circos is described as 'software package for visualizing data and information. It visualizes data in a circular layout — this makes Circos ideal for exploring relationships between objects or positions'. There are more than 25 alternatives to Circos for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Mac, Windows and Linux. The best alternative is D3.js, which is both free and Open Source. Other great apps like Circos are Tableau (Paid), RAWGraphs (Free, Open Source), Plotly (Freemium, Open Source) and Highcharts (Free Personal).
ChartBlocks is an online software platform that lets you quickly and easily build embeddable, shareable charts. Build a chart in minutes in the easy to use chart designer, choosing from dozens of chart types and then customising it to your needs.
Datacopia brings you a visualization experience that's been designed from the ground up to take the pain out of making charts and graphs, so you spend less time manipulating spreadsheets, and more time understanding your data.