I have made some updates to EcmaCalc, and it's reached version 0.4. The new features includes:
- Abortion of long-running scripts
- Syntax highlighting (still a bit buggy)
- Help
There are a few bugs left to sort out, but this version is a lot better than 0.1, so I decided to release it. If you notice any bugs or have any new ideas, post them in the comments.