RAW Graphs works with delimiter-separated values (i.e. csv and tsv files) as well as with copied-and-pasted texts from other applications (e.g. Microsoft Excel, Google Spreadsheets, TextEdit, …). It also works with CORS-enabled endpoints (APIs).
Link to website: http://rawgraphs.io/
- Up to date information about the software in this list, which is mostly free to use, can be obtained from this link