Nice little indoor garden.
The first plant is an aloe, not sure which species/variety (you may have to wait for flowers to know).
The second might be a Cistanthe (not sure exactly), maybe related to this one:
Rock Purslane (Cistanthe grandiflora)
You can expect brilliant purple flowers if I'm right there.
The third plant looks like a member of the Crassulaceae (a family of plants mostly with succulent leaves) but it is etiolated and you might need to see the flowers to tell what it is more specifically. It will continue to grow long, weak stems that need support or pruning until the light is stronger.
Your plants will benefit from being moved to pots with drain holes in the near future, when the time is right. In the meantime try not to leave a puddle of water at the bottom. Do your best to allow the soil to dry out down there in between watering. An unglazed clay pot will be much less problematic in this respect because it allows the moisture to evaporate through the sides, not just the top.
Fine sand does not usually work to your advantage, either mixed into the soil or applied on top of it, because it tends to retard the timely exit of water from the soil. When you repot your plants, try to find some other kind of fine gravel or coarse sand (like river sand for construction passed over a screen, like a window screen, to remove the fines), and keep the top dressing layer as thin as you can (ideally 1-2 rocks thick). That will make the watering easier down the road.