Hextech
Hexketch is a website that allows you to easily generate images of hexagonal tiles on a hexagonal grid
Offline Tools
Mzinga
Mzinga is a collection of open-source software to play Hive, with the primary goal of building a community of developers who create Hive-playing AIs. Works on Windows Mac and Linux
Nokamute
Nokamute is a open source hive AI, compatible with Mzinga.