Orbea Enol roadie, Fly Micromachine BMX, Fort Track fixed
You should only need allen keys and maybe a rubber mallet. First, remove the compression bolt from the top of the steerer tube (the bolt that sticks straight up). Next remove the stem. Take off any spacers and stuff from under the stem, and with a bit of luck the fork will just fall out. More than likely it wont, so you'll need to support the frame with one hand and hit the top of the steerer tube with a rubber mallet (or a hammer with a piece of wood to protect the steerer), quite hard, until it comes out.