Helvetica is perhaps the most popular typeface in the world. Every graphic designer swears by it, and you can't go wrong with it. Designed in 1957 by Max Miedinger, it's a surprisingly good fit for most design projects. However, it's not cheap, each weight can cost you €45.
So, here's a list of 7 alternatives to Helvetica free for commercial use*!
P.S. Here's something interesting: The phrases used in the images above are called Pangrams. They contain all the English alphabets at least once!
*These are free to use as of today, please refer to the license terms included in the downloads to make sure you are safe.