Another option are dip pens. They do not offer the same writing time as a regular fountain pen, but they are easier to clean and so let you experiment with exotic inks (such as those with particulate in them).
I'm particularly fond of glass dip pens, as they offer a steady flow and you can get 2-3 lines of text out before you need to re-dip. They're also absurdly easy to clean, as they don't have any "pinch" points which can hide ink from you. On the flip side, they basically have one "width", which is about a 0.8mm line for mine. It's also glass, with everything that entails.
I'm particularly fond of glass dip pens, as they offer a steady flow and you can get 2-3 lines of text out before you need to re-dip. They're also absurdly easy to clean, as they don't have any "pinch" points which can hide ink from you. On the flip side, they basically have one "width", which is about a 0.8mm line for mine. It's also glass, with everything that entails.