Some already mentioned, some not. That I've had my hands on, and can recommend:
Kershaw OSO Sweet. As the name says, sweet in the opening action, smooth, and nice and light in the pocket. Steel came screaming sharp, and is easy to get back to that. Flips and locks excellently every time, clip is nicely designed, handle ergonomic and non-slippy even when wet, good blade shape for most tasks
Ontario Utilitac. Heavy duty even if it's a liner-lock. Steel is tough and again very serviceable, opens and locks with confidence and ease, even with gloves. Different blade profiles to try, mine is tanto, and it's one of the sturdiest folders at low price nowadays
Byrd Cara Cara 2. One of the sliciest and meanest cutters you'll find in a budget, it's super thing and the g10 linerless version weighs nothing. The hole gives lots of purchase for a secure opening, the lock is strong and easy to manipulate with both hands. The grind and steel make it very quick to strop back or touch up, and isn't prone to corrosion or suffering chipping/damage. Ergonomically superior to most knives in this price range
KaBar Piggyback folder. Similar to the most excellent Dozier folder, similar low weight, plastic but strong handles and grind that lends itself to handle most EDC tasks with ease. Very nice recurve allows for bigger than expected cutting ability, the coating is nicely done and the action on mine is smooth as glass. Scales have attractive color, nice purchase and good curves.
Cold Steel Eland/Kudu. Excellent reproduction of classic knives, very thin and so very mean cutters, perfect for food and as backup, because of their long blades, super slim profile and unnoticeable weight. Not made for abuse or OHO opening but can stand heavy use and will be confident companions in most hikes, urban chores or day to day living at an absurdly low price