Some important items to consider: while volunteer.legal is being actively used by several collaboratives to organize immigration workshops, there are still bugs. It is the developer's (John's) intention to fix all bugs that he is made aware of, but this is a volunteer project so he's not making any promises. Additionally, there are currently no global backups of the system. If something goes horribly wrong (and, fingers crossed, that won't happen) all of the data in the system could be irretrievably lost. You will be using this system at your own risk. That being said, everyone's definitely going to try and make sure that doesn't happen (and you can choose to manually export your data from volunteer.legal and save it locally, as a spreadsheet file).
Finally, you are being granted permission to use this system, but that permission can be revoked at any time. Specifically, gross negligence on the part of an individual user or organization, that negatively impacts other organizations / users of the system, could result in accounts being banned.
Anyway, I think that covers the negative stuff. I made this application because organizing immigration workshops using Google Forms is ridiculously tedious and time consuming. In the end, I think it's the volunteer who suffers. Volunteer.legal should make your life WAY easier while also improving the volunteer's experience. If it doesn't, let me know.
--John (the developer)