Futoshiki Solver

(You're going to need to install Java for this.)

Click between cells to add and change rules
Click a cell to select; type numbers or press ‘delete’ to set or clear cells
The ‘Current state’ panel shows if any rules are broken
Use the ‘Solve’ button to find a solution to the current puzzle, if possible
Click ‘Edit...’ to bring up a text editor with the puzzle state in. Use copy and paste to capture or modify

This software is distributed under GPLv3, and source is available: futoshiki-src.zip