Recs.
Updated
Pharo is a modern Smalltalk dialect designed with the professional in mind. It is very compact, including the virtual machine, and has a fast startup time.
SpecsUpdate
Pros
Pro Simple language, live environment, (almost) everything available for exploration and modification
Pro Graphics, graphing and visualisation framework - Roassal
Roassal and Mondrian provide fantastic and easily used frameworks for graphics, graphing and advanced visualisations (comparable to D3.js) but with much less code. Visualisations can be rendered into web friendly graphics (SVG, .png etc.) without additional work.
Pro Beautiful coding patterns in your IDE
No need to search google for compact beautiful examples of how to do things, your live environment source is available and you can easily live search, see how it works and copy how the masters would do it (examples most languages still copy too).
Cons
Recommendations
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