Sorry, not a user yet of any and only at the beginning of visual observing. But I'm thinking of going into the crowd so my data might help others and I can benefit from theirs:
https://www.deepskylog.org/index.php...ervations=true
Here's a feature overview
https://github.com/DeepskyLog/DeepskyLog/wiki/What's-New-in-DeepskyLog
They also have an import function for exports from other software.