Lato is an open-source, humanist sans-serif typeface designed by Polish designer Łukasz Dziedzic in 2010. Lato was originally designed for a corporate client, but after the client went in a different stylistic direction, Łukasz decided to release the font to the open-source community. I’m personally very fond of the italic style of Lato.
If you are looking for an alternative to Lato, I personally recommend checking out Open Sans and Alright Sans. I think Lora would make a nice font combination with Lato.