Index: binaries/data/mods/data_validator/gui/data_validator.js
===================================================================
--- /dev/null
+++ binaries/data/mods/data_validator/gui/data_validator.js
@@ -0,0 +1,76 @@
+var templates = Engine.ListDirectoryFiles("simulation/templates", "*.xml", true);
+var technologies = Engine.ListDirectoryFiles("simulation/data/technologies", "*.json", true)
+	.map(tech => tech.replace("simulation/data/technologies/", "").replace(".json", ""));
+var ressourcesCodes = new Resources().resourceCodes;
+
+let civs = loadCivFiles();
+var civCodes = [];
+for (let civ in civs)
+	civCodes.push(civs[civ].Code);
+
+function validate_techs()
+{
+	var foundTechs = {};
+	// Hardcode a few techs as being seen despite them not being in templates.
+	foundTechs.phase_town = 1;
+	foundTechs.phase_village = 1;
+	foundTechs.phase_city = 1;
+	foundTechs.advanced_unit_bonus = 1;
+	foundTechs.elite_unit_bonus = 1;
+
+	let tokensFormat = /([^ ]+( |$))+/;
+
+	for (let templateName of templates)
+	{
+		if (templateName.indexOf("special/filter") !== -1)
+			continue;
+
+		let template;
+		let techs = [];
+		try {
+			template = Engine.GetTemplate(templateName.replace("simulation/templates/", "").replace(".xml",""));
+			if (!template.ProductionQueue || !template.ProductionQueue.Technologies ||
+				 !template.ProductionQueue.Technologies._string)
+				continue;
+			if (!template.ProductionQueue.Technologies._string.match(tokensFormat))
+				warn("Technology tokens of " + templateName + " are not following the proper format: " + template.ProductionQueue.Technologies._string);
+			techs = template.ProductionQueue.Technologies._string.split(" ");
+		} catch(error) {
+			warn("Error parsing " + templateName + ":\n" + error);
+			continue;
+		}
+		for (let tech of techs)
+		{
+			if (tech.startsWith("phase_") && template.Identity.Civ !== "athen")
+				tech = tech.replace("{civ}", "generic");
+			else if (tech.indexOf('{civ}') !== -1)
+				tech = tech.replace('{civ}', template.Identity.Civ);
+
+			let index = technologies.indexOf(tech);
+			if (index === -1)
+				warn("unknown tech " + tech + " referenced by template " + templateName);
+			else
+			{
+				if (!(tech in foundTechs))
+					foundTechs[tech] = 0;
+				++foundTechs[tech];
+			}
+		}
+	}
+
+	for (let tech of technologies)
+	{
+		let techData = Engine.ReadJSONFile("simulation/data/technologies/" + tech + ".json");
+		if (techData.autoResearch)
+			foundTechs[tech] = 1;
+		if (foundTechs[tech] && techData.top)
+			foundTechs[techData.top] = 1;
+		if (foundTechs[tech] && techData.bottom)
+			foundTechs[techData.bottom] = 1;
+	}
+
+	for (let tech of technologies)
+		if (!(tech in foundTechs))
+			warn("Technology " + tech + " not found in any template.");
+}
+validate_techs();
Index: binaries/data/mods/data_validator/gui/data_validator.xml
===================================================================
--- /dev/null
+++ binaries/data/mods/data_validator/gui/data_validator.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<objects>
+	<script directory="gui/common/"/>
+	<script file="gui/data_validator.js"/>
+	<object type="image" style="ModernWindow">
+		<object style="ModernLabelText" type="text" size="50%-128 4 50%+128 36">
+			<translatableAttribute id="caption">Data Validator</translatableAttribute>
+		</object>
+	</object>
+</objects>
Index: binaries/data/mods/data_validator/gui/page_pregame.xml
===================================================================
--- /dev/null
+++ binaries/data/mods/data_validator/gui/page_pregame.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<page>
+	<include>common/modern/setup.xml</include>
+	<include>common/modern/styles.xml</include>
+	<include>common/modern/sprites.xml</include>
+
+	<include>data_validator.xml</include>
+</page>
Index: binaries/data/mods/data_validator/mod.json
===================================================================
--- /dev/null
+++ binaries/data/mods/data_validator/mod.json
@@ -0,0 +1,8 @@
+{
+	"name": "data_validator",
+	"version": "0.1",
+	"label": "Data validator",
+	"url": "https://play0ad.com",
+	"description": "Automatically validate files.",
+	"dependencies": []
+}