I'm a fan of sudoku, nonogram, and other various grid logic puzzles. I really liked to see something like this and this. But to post such a puzzle (or a solution to such a puzzle), I need to draw them. And I want them to be nice to see and use.
How do you draw such puzzles (and partial solutions)? Do you have any tools to help you draw such a nice-looking grid puzzles? Even better would be a tool that is not restricted to square grids, and can also draw hexagonal/triangular grids like this. And if you know Slitherlink / Tapa / Masyu / Yajilin / Star Battle / Spiral Galaxies... the ability to add various markers in the cell and borders would be really nice too.