There are quite a few, here are some I know of:
Free on green and EE:
- Most Batchelors Pasta n Sauce (do a search on here for full details)
- Most (if not all) Batchelors savoury rice
- Mugshots (apart from the creamy cheesy ones)
- Asda tinned chickpea dahl
Free on red and EE:
- Tesco tinned stewing steak
That's all I can think of in terms of easy meals/snacks... but there are loads of threads on here if you have a look through, plus people's food diaries have a lot of info on them too for ideas.
Hope that helps x