Instrumental only music and some of it is really great for beginning, end, and background music for training. Royalty free, and big selection! They specifically indicate you can use their music for a 'variety of projects'.
dominKnow | ONE provides a number of system variables such as Learner Progress and Test scores. This information is typically displayed on endscreens, but you may wish to customize those endscreens or even create your own variables. With most of these variables they will also provide data down to several decimal places. Such as 54.745. This may be too many decimal places for you and you might simply want the number to be rounded up to the nearest whole number.
I have a situation where I want to display code that has specific leading spacing in the code sample and I want the learner to be able to view the proper design and copy and paste it into thier coding system. Right now when I put the spacing in dominKnow it deletes and removes the extra spaces after I add the object.