Other questions have done a good job of outlining where to find online players and some of the tools available for ongoing virtual games (Roll20, Fantasy Grounds, etc). Many of those tools have a cost associated with them and a large time commitment to configure a custom, homebrew game.
Occasionally, circumstances prevent us from gathering in the way we prefer. The 2020 COVID-19 pandemic is a good example. During those times, finding ways to continue to play together, even if in a non-standard, non-permanent way, is important.
In this question, I'm interested to know what DMs and their players are using to temporarily convert their normal pen and paper, in person gatherings into a system that works with a remote group. I'm not looking for specific software recommendations, though a good answer may include one. Instead, I'm primary interested in the high-level strategy being used to continue roleplaying while not in the same room together.
I'm specifically interested in answers that address the following common concerns with this type of conversion:
- Temporary - Appropriate for short term game play, not running an entire campaign
- Roleplaying - Support for high quality, low delay communication
- Content - Handling custom content including maps, handouts, items, etc
- Combat - Handling combat positioning, distances, and area effects normally done on a battle mat