After a seemingly never-ending torrent of (GCE level) maths homework, I’ve had to turn to Microsoft Math for help. I can’t recommend it enough as it does everything I need it to do. And for $20 (about £10), it’s hardly going to break the bank. Unfortunately, it’s not received an update for about 18 months and it doesn’t appear to be updated any time soon but it’s still a solid piece of software and definitely worth the price. You could even argue that it doesn’t need updating.