What are some free, open source, or low-cost authoring tools to create e-learning modules?

Though i am not so technical, but i have seen my tech team uses one of them hope this will helpful to you, No ranking but these all are good to try.

:::: xical.org ::::
Class GEORGE E NEWMAN THIRD MILLENNIUM MARKETING LLC ®
eXe
Wink
Xerte
h5p

Don’t think that Adapt Learning Project Community is a match for you.

I found some useful links maybe you can find some more on this.
Free and Open Source Authoring Tools for e-Learning – eFront Blog,
The Ultimate List of HTML5 eLearning Authoring Tools – eLearning Industry

You can discuss such topics on worldwide Community for the e-learning enthusiasts .