Zibo's popular freeware aircraft, the 737, was updated to version 3.39 today. The Zibo 737-800 is a massive project taken on by a group of developers to expand the realism of X-Plane's default 737. Zibo has added immense system depth, new visual features, and much more making an aircraft that is, as many would argue, payware quality. Excel video training. Excel for Microsoft 365 Excel 2021 Excel 2021 for Mac Excel 2019 Excel 2016 Excel 2013 Excel 2010 Excel for Mac 2011. Quick start.