A mind willing to consider new ideas.

Willing to consider new and different ideas or opinions.

open up (especially referring to doors)

Any successful means of achieving a result, especially means that are magical or technical, or otherwise beyond the understanding of most people.

A device used to remove the cap from a bottle / A device used to remove the cork from a bottle

(software) Of or relating to a product which is licensed to permit modifications and redistribution of its source code, as per The Open Source Definition.

(transitive) To release the source code of.

(software) The practice of providing open-source code for a product. / (software) Open-source software in general. / (espionage) Information that is in the public domain and available to everybody.

Alternative form of open-source

A pair of small low-powered binoculars for use at a theatrical performance.