no9 Footsteps Package just landed in Unreal Marketplace. If you are Unreal Engine user then it might be worth checking. It is quite big and as name just states it contains various walking sounds:
New Footsteps pack 2 is available in Unity3D Asset Store. It contains over 2200 unique oneshot sounds of walking on surfaces like: grass, dry leafs, dirt road, forest cover, hay, mud, puddle, stones, bricks rubbish, glass grit, dirty cardboard, rusty wire fence, thickets, snow, ice.
More detailed description can be found on asset page in store.
Yet another collection of footsteps sounds is available in Unity3D Asset Store from now. Footsteps pack 3 is kind of different approach offering wide spectrum of sounds ranging from natural sounds of humans walking in shoes, animals to monsters, robots and cartoon or arcade games characters.
Every type of sound comes in up to two similar but distinguishable variations (let’s say for the left and the right foot) which should be used one by one and additional modulation should be applied by the engine (pitch/lfo, volume, reverbs) for the flavor.
Footsteps pack 3 gives you flexibility when prototyping a game. It is also fine to use in “less than AAA titles” like arcade type of games, 8-bit/oldschool stylized, fantasy, sci-fi, shooter, you name it, games.
Previous packs are here: