ColorTube is the first FREE *colored font by Ivan Filipov. He started working on it a few years after he created Multicolore. The typeface is constructed following geometric principles.
Also, notice that not all endings or crossings are following the “color overlay” logic—as Ivan says himself he did some changes to make it more appealing. For now, ColorTube supports Basic Latin character set.
In the future, he’s planning to add accented character and diacritics, as well as Cyrillic. You can see more of Ivan’s projects on his website – neogrey.com *Colortube requires Adobe CC 2018 to work properly as a color font.
You can use this font for both personal & commercial.