I am more often than not the player with the most lands at the table (or tied for the most) when I am playing Boros, Mono White, and Mono Red. Lately I have considered white to be my go-to ramp color as its variety of options to gain mana advantage from lands is impressive and growing.
In this list I am focusing on ramp specifically, not to be confused with mana acceleration. I am fully aware of how powerful Ashnod's Altar and Smothering Tithe are.
Some important things to note about white ramp tech is that many of them require or greatly benefit from enablers, which I have listed. For example, Brought Back is a recursion spell that can act as a 2-mana Explosive Vegetation if you've cracked two fetch lands on the turn you cast it, but if you're running a deck with 37 basic Plains as your mana base, that will prove far more difficult. You can always use the budget fetches if you're unprepared financially to saddle a set of classic dual fetches.