I was just going to recommend boardspace.net here! It also somewhat recently went open source: https://github.com/ddyer0/boardspace.net https://github.com/ddyer

I was just going to recommend boardspace.net here! It also somewhat recently went open source: https://github.com/ddyer0/boardspace.net https://github.com/ddyer0/boardspace.net It clearly is stuck in the Java Applet era where it started but Dave eventually made an Android port and modern Java has no issues running it!