Soup - make it the way you like then add some extra water - lumpy with water will make you feel full.
Eat plenty of fibre and have some protein every time you eat if possible.
Useful supplements to help if you crave sugar are chromium and cinnamon.
The worst foods for making you feel hungry shortly after are the things that have a lot of fat and a lot of sugar but not much fibre eg ice-cream, chocolate, cheesecake.
Alcohol has a lot of calories too.
How about substituting celeriac or sweet potato chips for (ordinary) fries? Substituting mashed carrots/sweet potato/celeriac/swede for part of your potatoes in mash will reduce their calories and if you really like them creamy add a small amount of cream instead of butter.
Caffeine causes you to produce adrenaline which causes blood sugar spikes so cut down if possible but don't substitute with drinks that have artificial sweeteners - they don't fool your body - you'll end up eating the same amount of calories.
Instead of crisps you could have kale crisps - roast washed and carefully dried kale (take the tough middle stalks out) on a baking tray with salt and whatever spice you fancy and a little olive oil for a few minutes. leave to dry out - keeps in an airtight tub for a few days (if you don't eat them!)
Fill your plate with loads of veg and or salad instead of pasta, rice or potatoes. It will be a load of food but with fewer calories.
Do you like porridge? - It's easy to make if you soak the porridge oats in the pot the night before. It should keep you full for ages - sprinkle a few seeds on the top if you like.
Drink herbal teas if you associate snacks with your cup of tea or coffee to cut the association. I like rosehip and or hibiscus tea sweetened with half a teaspoon of yacon syrup or xylitol; these are not artificial sweeteners.
Substitute dark chocolate for milk chocolate - even I can't eat more than three squares of the dark stuff.
Brush your teeth instead of snacking.
Drink plenty of water and herbal teas (avoid smoothies though)
Eat as slowly as you can manage so your stomach has time to tell your brain that you're full.
Make a huge salad and have salad leaves and crudités ready to snack on. Experiment with different dressings eg lemon juice, balsamic vinegar, pomegranate molasses etc.
Read labels.
Avoid take-aways and fast-food outlets like the plague.