I have a set of eclipse and ant based tools for modding with Sins that others may find useful when validating or building their projects.

Current Downloads (older downloads: Downloads) 

FAQ

System Requirements 

Syntax Wiki - A syntaxual representation of almost all of the Sins editable files.

How To's:
How To Install Eclipse
How To Setup Entity Validation Eclipse Plugin (Updated for new preference with v0.6)

Video: How to setup and configure the Soase Eclipse Plugin

References:

Mod Development with Eclipse (Forum link providing a general overview of Eclipse)

Eclipse download site (http://eclipse.org/downloads)

Tools Supported:

Entity Editor (Click me for cool stuff about visual Entity Validations)

Eclipse Editor builder/nature extension that provides visual feedback to the following validations.

Entity Definition View - Displays the syntax rules for the currently opened entity file.

Summary of validations currently supported:

Boolean: Validates boolean entries contain TRUE or FALSE only
Brush: Validates a referenced brush entry exists for the value entered
Conditional Validation: Allows conditional structures to follow based on a field value
Key word: Validates all entity file key words are spelled correctly
Quotes: Validates any values requiring qoutes have beginning and ending quotation marks
Integer: Validates integer entries contain digits
Decimal: Validates decimal entries contain ####.#####
Entity References: Validates a referenced entity file exists for the value entered
String Reference: Validates a referenced String entry exists for the value entered
Sound Reference: Validates a referenced Sound entry exists for the value entered
Enumeration Validation: Validates an entry confirms to an allowed set of values (i.e. buffInstantActionType)
Iteration Validation: Validates repeating elements are correct
Structure Validation: Validates entries appear in the correct order in the entity file (configurable to allow unordered structures)
Explosion Validation: Validates a referenced explosion entry exists for the value entered
Texture Validation: Validates a referenced texture exists for the value entered
Particle Validation: Validates a referenced effect exists for the value entered
Sounddata Validation: Validates sounddata files for correctness including referenced sound files
GalaxyScenarioDef Validation: Validates galaxyScenarioDef files for correctness with 2 pass validations
StringInfo Validation: Validates English.str for correctness
Brushes Validation: Validates brushes files for correctness
Gameplay.constants: Validates the Gameplay.constant file for correctness
Explosiondata Validation: Validates sounddata files for correctness including referenced sound files
Galaxy Validation: Validates galaxy files for correctness and performs additional validations on referenced templates and design names.

Content Assistance: [ctrl]+[space bar] on keywords or constants and get suggested completions
Syntax Coloring: change syntax coloring of entity files to suit your preferences (defaults to all black currently)
Hover Help: hover over a keyword and get additional details about the value or structure
Quick link to wiki syntax