I always enjoy low-level adventures as a GM. It always seems to be more about the play and less about "the power". Low-level adventures are also easier to run in my experience, as most rulesets tend to break down a bit at higher levels. The Book of Beginnings is a series of low-level adventures for 5e (and I suspect easily converted on the fly to one of the older D&D rulesets and the various clones and simularums)
Some of the adventures are (you get at least 10 adventures):
Tower of Senleros: An abandoned tower seems to be active once more. A young mage apprentice went off to explore the secrets this tower may hold. The town is in need of adventurers to save the young wizard! (1st Level)
Battle of the Dance: Local nobles are in need of fresh adventurers to be their champions at a charity ball. You must represent your patron, impress other nobles, and possibly perform bardic tale to influence. However, where great wealth gathers, trouble soon follows. (1st Level)
Tomb of Sir Cadogan Kerrington: Adventure into a disgraced knight's tomb to find what treasures he wrongfully acquired! (3rd Level)
Guardian of the Grove: An ancient grove dedicated to the nature god Pan is under attack. Find a way to stop the radical cultists before they defile the shrine! (3rd Level)
Mystery at Mistwood: The town of Mistwood is experiencing unknown horrors. At night the town gets deathly chill. Townsfolk are found in the morning petrified. Investigate the village to put an end to the mysterious terror! (5th Level)Buy-in is 15 bucks for the PDF and 30 bucks for the Print plus PDF.