If you're attending a workshop with a casting director, or whomever can help support your blossoming career, did you know that you should pre- and post-game these individuals? Postcards work exceptionally well even during this current time of the internet and emails. Some people LOVE getting physical mail, but it doesn't hurt to ask their preference.
Touchnote allows you to create your very own postcards to send to anyone! They cost a few bucks once they're designed, but you can also save the recipient's address so you don't have to go searching through your Rolodex.
Remember to keep the card short and sweet, as you'll be sending them out frequently (probably 1x month) with updates!
Please keep in mind that this is a live document and will be updated with resources when they become available.