The VAST Platform is a comprehensive integrated development environment (IDE) that works with a Smalltalk language runtime. Because it's Smalltalk-based, the IDE and the runtime are essentially a development 'image' that's executed by a virtual machine (VM).
First released as IBM® VisualAge® Smalltalk in 1993, the VAST Platform has built upon this original foundation starting in 2005 and has continued to grow in power and flexibility through ongoing research and development.
VAST has evolved beyond what the original VisualAge developers could have foreseen, and allows developers to quickly iterate new ideas with proven Smalltalk-based live programming methodologies and deploy to a variety of desktop, cloud, Internet of Things (IoT), and on-premise server hardware.
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Pros
Pro Business support
If you pay for the premium version, you will get great support.
Pro Stable
Pro Backward compatible
You can count with VAST Platform providing backward compatibility or a documented migration guideline in case it is not.
Pro Being actively developed with predictable future
Cons
Con Pricy for business
The price is $6,995 for a new license. Updates are cheaper at about $1,995.