This is an extremely useful and reliable add-on. I'm using it regularly during development to get rid of old version…
okapi
This add-on (based on guyasyou's add-on List of all page versions) displays a list of collection versions including a client (browser) based table sorter.
Obsolete versions can be scanned and deleted. An obsolete version is defined as versions of a collection having
Page is created as Dashboard/Sitemap/Enhanced Version List
(yoursite.com/index.php/dashboard/sitemap/tds_enhanced_version_list)
Tested on 5.7.5.9 and 8.1.0
GitHub
https://github.com/dausi/tds_enhanced_version_list
Donations
I don't expect any compensation for this add-on. If it has been useful to you feel free to donate to me via PayPal.