Xmas Lite is a modern and free WordPress Bootstrap theme by Themesaga that was updated not too long ago and has over 200 installs in the last three months.
With over 1000 installs, "eCommerce Market", the free WordPress ecommerce theme by Rigorous Themes, could be a great choice for a multipurpose ecommerce website.
With more than 2000 installs, Blossom Feminine, a free WordPress ecommerce theme by Blossom Themes, would be a great choice also for fashion and personal websites.
Downloaded by more than 300 people in the last six months, the free WordPress theme "bFastMag Shop" might be the right choice for your next WP website.