Those Who Wander is a bit of its own Fantasy RPG, and a bit of an extension to D&D, if you so choose. You can use it to run your own games, or you can use it to enhance your 5th edition campaign you're running (or about to begin) with expanded rules for things like parentage and how your characters progress and level up. The book is up on Kickstarter now.
From the campaign:
Those Who Wander is a dynamic 5e-alternate fantasy tabletop game system distinct for its exponentially growing character paths, diverse and versatile parentages, enigmatic and awakening heirlooms, mechanically defining character backgrounds, and more.
The game’s name comes from the popular line, “Not all those who wander are lost,” originally penned by J.R.R. Tolkien. In more ways than one, Those Who Wander epitomizes the journey made of numberless steps. Each step is a decision—left or right. And each decision leaves its mark on you. No matter where you wander, we hope you feel at home all along the way.
The campaign is just up and over their funding goal with 17 days left to go.