This is an article published by the National Council of Teachers of Mathematics offering tips for tutors. Most of these could also be applied when creating videos to post online for students to use as well.
Teachem is a way to create a lesson for students based on a set of videos. Teachers can add bookmarks for the video so that when students want to review on a certain topic in the video, they just need to click on the bookmark and it will jump right to the point in the video that discusses it. Teachers can also add questions that the students need to answer which may be useful in a flipped classroom as a way to ensure that students are watching the video.
(Actually 6 now because it looks like Sketchcast is no longer available.)
A annotated list of different screen capture tools that teachers can use to create screen captures. These can be used to create videos of your computer screen to create your own lessons or even instructional videos to give students directions on what to do or how to use a certain application even in a flipped classroom setting. Some of these resources also have other uses including editing capabilities and the ability to upload other types of videos.
Knowmia is a collection of lessons and videos on a large variety of subjects. Students can use these videos when they need help at home or teachers can have students watch these videos as an introduction to a lesson or as example problems in a flipped classroom setting.