Here is a comparison matrix to see which is best suited for you: using Sigasi as an Eclipse VHDL plugin or downloading it as a standalone VHDL editor.
|Standalone Sigasi Pro||Eclipse|
|Separate Eclipse download||✓|
|Eclipse versions||Bundled with Eclipse 3.7||Eclipse 3.6 or higher|
|Compatible with Eclipse plugin mechanism||✓||✓|
|Recommended without prior knowledge of Eclipse||✓|
|Recommended if you also work with C, C++, Java, …||✓|
|Installation instructions||Download it||Plug it in|