Atlassian Jira's has a feature to capture estimations and remaining estimates in issues. You can configure Jira to show these numbers on the issue cards in scrum board.
I found it useful to see the sum of all issues for each column. Unfortunately, Jira lacks such a feature.
When turned on, this Chrome extension will calculate the sum of "remaining estimates" for each column, taking into account all issues being displayed. If you apply a filter, the sum will be calculated only for the issues matching your filter settings.
With version 1.00, the plugin additionally shows the number of cards, per column, in brackets. This additional feature was added by Jan Topiński (simcha).
The extension was tested with Jira cloud and with Jira 7.3.8. Happy to get your feedback!