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diff --git a/logic/InstanceList.h b/logic/InstanceList.h
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+++ b/logic/InstanceList.h
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+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QObject>
+#include <QAbstractListModel>
+#include <QSet>
+#include <gui/groupview/GroupedProxyModel.h>
+#include <QIcon>
+
+#include "logic/BaseInstance.h"
+
+class BaseInstance;
+
+class QDir;
+
+struct FTBRecord
+{
+	QString dirName;
+	QString name;
+	QString logo;
+	QString mcVersion;
+	QString description;
+	QString instanceDir;
+	QString templateDir;
+};
+
+class InstanceList : public QAbstractListModel
+{
+	Q_OBJECT
+private:
+	void loadGroupList(QMap<QString, QString> &groupList);
+	QList<FTBRecord> discoverFTBInstances();
+	void loadFTBInstances(QMap<QString, QString> &groupMap, QList<InstancePtr> & tempList);
+
+private
+slots:
+	void saveGroupList();
+
+public:
+	explicit InstanceList(const QString &instDir, QObject *parent = 0);
+	virtual ~InstanceList();
+
+public:
+	QModelIndex index(int row, int column = 0, const QModelIndex &parent = QModelIndex()) const;
+	int rowCount(const QModelIndex &parent = QModelIndex()) const;
+	QVariant data(const QModelIndex &index, int role) const;
+	Qt::ItemFlags flags(const QModelIndex &index) const;
+
+	enum AdditionalRoles
+	{
+		InstancePointerRole = 0x34B1CB48, ///< Return pointer to real instance
+		InstanceIDRole = 0x34B1CB49 ///< Return id if the instance
+	};
+	/*!
+	 * \brief Error codes returned by functions in the InstanceList class.
+	 * NoError Indicates that no error occurred.
+	 * UnknownError indicates that an unspecified error occurred.
+	 */
+	enum InstListError
+	{
+		NoError = 0,
+		UnknownError
+	};
+
+	QString instDir() const
+	{
+		return m_instDir;
+	}
+
+	/*!
+	 * \brief Get the instance at index
+	 */
+	InstancePtr at(int i) const
+	{
+		return m_instances.at(i);
+	}
+	;
+
+	/*!
+	 * \brief Get the count of loaded instances
+	 */
+	int count() const
+	{
+		return m_instances.count();
+	}
+	;
+
+	/// Clear all instances. Triggers notifications.
+	void clear();
+
+	/// Add an instance. Triggers notifications, returns the new index
+	int add(InstancePtr t);
+
+	/// Get an instance by ID
+	InstancePtr getInstanceById(QString id) const;
+
+	QModelIndex getInstanceIndexById(const QString &id) const;
+
+	// FIXME: instead of iterating through all instances and forming a set, keep the set around
+	QStringList getGroups();
+signals:
+	void dataIsInvalid();
+
+public
+slots:
+	void on_InstFolderChanged(const Setting &setting, QVariant value);
+
+	/*!
+	 * \brief Loads the instance list. Triggers notifications.
+	 */
+	InstListError loadList();
+
+private
+slots:
+	void propertiesChanged(BaseInstance *inst);
+	void instanceNuked(BaseInstance *inst);
+	void groupChanged();
+
+private:
+	int getInstIndex(BaseInstance *inst) const;
+
+	bool continueProcessInstance(InstancePtr instPtr, const int error, const QDir &dir,
+								 QMap<QString, QString> &groupMap);
+
+protected:
+	QString m_instDir;
+	QList<InstancePtr> m_instances;
+	QSet<QString> m_groups;
+};
+
+class InstanceProxyModel : public GroupedProxyModel
+{
+public:
+	explicit InstanceProxyModel(QObject *parent = 0);
+
+protected:
+	virtual bool subSortLessThan(const QModelIndex &left, const QModelIndex &right) const;
+};