Oddthinking

If your blog is over a year or two old, you may have noticed the list of archive pages is getting unwieldy.
This plugin is a widget that compresses the size of the arcgives list to two lines per year (three if the lines are narrow) rather than one line per per month.
<h3>More information</h3>
This widget is licensed under <a href="http://www.gnu.org/licenses/gpl-3.0.html" rel="nofollow ugc">GPLv3</a>.
Grateful thanks to <a href="http://tech.windsofstorm.net" rel="nofollow ugc">Alan Morgan</a> whose widget_archives2 I used as a template.
Potential developers should check out the <a href="http://www.somethinkodd.com/oddthinking/2007/03/29/more-theme-changes-2/" rel="nofollow ugc">development history</a>.
Finally, an obligatory plug for my blog, <a href="http://somethinkodd.com/oddthinking" rel="nofollow ugc">OddThinking</a>.

Compact Monthly Archive

Show a monthly archive list in a compact format - one letter per month.

alek

Shows a popover with list of links to the posts of the month/day.
Compatible with ARCW 1.0.9+
This will not work if you don’t have Archives Calendar Widget installed/activated. 
Get it here : <a href="https://wordpress.org/plugins/archives-calendar-widget/" rel="ugc">Archives Calendar Widget</a>
There is no any settings, just install and activate.
<h4>Notes</h4>
Please use the Support section to report issues.

ARCW Popover Addon

Popover Addon for Archives Calendar Widget

Compact Monthly Archive vs ARCW Popover Addon