Shotcut is an excellent free video editor that allows you to add plain text or 3D text into your video/ clip by using Filter. You can also adjust the size, position, color of your text easily.
This tutorial video will show you how to add and adjust 3D text and plain text into your video.
Shotcut is a free, open source, cross-platform video editor for Windows, Mac and Linux. Major features include support for a wide range of formats; no import required meaning native timeline editing; Blackmagic Design support for input and preview monitoring; and resolution support to 4k
You can read our full review about Shotcut here!