Hello everyone!
Just thought I'd post this on the forums in case people are looking for an alternative to Tiled. I've been developing it for ~2 months now for one of my own projects so I don't know if people will find it useful or not

Any feedback is greatly appreciated
About Chestnut
Chestnut is a tile map editor. It’s designed to accommodate both the single developer and large development teams by unifying maps as one project.
Features:
- Unified map settings and tileset referencing
- Simplified open standard XML-based file format
- Multiple drawing brushes
- View surrounding maps in editor, ensuring maps connect properly
- Java & C# APIs
- Collision Editor – visually draw collisions on your maps
- Property Editor – visually insert properties to your maps, allowing for simplified NPC, event and script addition
- World Exporter – export a scaled down image of your game world
Why Chestnut?
While Tiled is a great tool, in developing certain projects I found it to be slightly inefficient in the some areas:
- Dynamic map loading of maps at runtime often resulted in minor lag due to required decompression
- Loading over 250 maps at once (e.g. on a game server) would result with insane amounts of RAM being used up
- Mapping teams often messed up when linking maps together since they could not visually see the maps beside each other
Some features of Chestnut also came from these problems I've encountered:
- Content teams were slowed down by not being able to visually insert scripted events to map coordinates
- Inexperienced mapping teams often deviated from map dimension or layering standards, Chestnut enforces project-wide standards
Official Page
http://bitsoc.com/?page_id=5
APIs
http://bitsoc.com/?p=91