liveGap Charts is described as 'Free online chart generator'. There are more than 10 alternatives to liveGap Charts, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and Self-Hosted solutions. The best alternative is D3.js, which is both free and Open Source. Other great sites and apps similar to liveGap Charts are RAWGraphs (Free, Open Source), Plotly (Freemium, Open Source), Chart.js (Free, Open Source) and Frappé Charts (Free, Open Source).
D3 allows you to bind arbitrary data to a Document Object Model (DOM), and then apply data-driven transformations to the document. For example, you can use D3 to generate an HTML table from an array of numbers.
RAWGraphs is an open source app built with the goal of making the visualization of complex data easy for everyone. Born as tool for designers and vis geeks, RAWGraphs aims at providing a missing link between spreadsheets and vector graphics editors.
Frappé Charts is a simple, responsive, modern charts library for the web with zero dependencies and a roughly 15k gzipped file size. From the makers of ERPNext, the library offers a fast alternative with minimal effort needed to visualize data in sleek charts.
The Google Charts is an extremely simple tool that lets you easily create a chart from some data and embed it in a webpage. You embed the data and formatting parameters in an HTTP request, and Google returns a PNG image of the chart.