MKVToolNix
This software can create container files where you have several video or audio channels. It’s free and available for Mac and Windows. You can get it here: https://mkvtoolnix.download/
Windows
Subtitle Edit Online
Subtitle Edit Online is an online subtitle editor with some extra features including synchronization. (http://www.nikse.dk/SubtitleEdit/Online)
Colours in Cultures
Information is Beautiful is a website with information about how different colours are interpreted in different cultures. For example in western cultures white represents (among others) heaven, whereas in Hindu white stands for intelligence. (http://www.informationisbeautiful.net/visualizations/colours-in-cultures/) Gem
Lorem Ipsum
If you ever need filler text, to see what a layout will look like filled with text then try out this website. Here you can generate different types of filler texts. (http://www.lipsum.com/)
DaVinci Resolve
DaVinci Resolve is a free video editor available for Mac and Windows. The main focus of this software is color correction. (https://www.blackmagicdesign.com/products/davinciresolve) Gem
Colour Theory
There are two websites with interactive color wheels to help you find the right color combination for your project. Adobe Color Wheel, SessionsCollege & Malanenewman Summary Gem