Tonic: Data Visualizing REPL for Node
Tonic (via Wolf Rentzsch, comments):
Tonic has an entire host of object viewers to help you visualize your data. From high level views like graphs and maps, to low level hexadecimal inspectors, you can pick and choose the best way to look at your data after creating it.
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Time traveling in Tonic allows you to rewind your work to a previous point and pick up where you left off. That's because your work is checkpointed after every execution.
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Tonic has built-in support for ES7 async and await making it incredibly async friendly. Instead of fiddling with chains of callbacks, you can write your asynchronous node.js code in a linear and straight-forward way.
