Monofilament lines come in a variety of colors, sizes and strengths. It is usually cheaper than other types of lines and works well in a variety of fishing conditions. These lines are designed to be limp and soft, making them cast easily on spinning reels. They are usually best for open water since they have little abrasion resistance.
Stren Magnathin is a limp thin line that works well on spinning reels and when fishing crankbaits and trick worms. It is strong for its size.
Trilene XL is a very limp line that is useful on spinning reels and other applications where limp line is needed. It is consistently strong and consistent.
Hurricane line is made is Korea and is a good thin line.
Stren Easy Cast is a thin, limp line that casts good and is a small diameter, limp line.