marushu

<a href="https://github.com/marushu/sequential_posts_numbering" rel="nofollow ugc">This plugin published on GitHub.</a>
This plugin will serialize your posts. Since this plugin simply outputs numbers only, it’s up to you to incorporate it into html or styling with CSS. 🙂 
It demonstrates its power with archives and single pages in the loop. 😛 
Now added ?order?, ?raw? options. See Parameters.
<h3>Contact</h3>
Twitter: @marushu 
email: shuhei.nishimura[at]gmail.com

Sequential posts numbering

This plugin will serialize your posts. Since this plugin simply outputs numbers only, it's up to you to incorporate it into html or styling with  …

shawfactor

mattsenate

This plugin is can be used for petitions, events, or any verified list and as far as I know is unique in WordPress.
Creating a petition/list/signup is as easy as adding a shortcode to a post or page (or CPT). From there additional editors are available to configure easch aspect of the sign up. Everything is completely self hosted and all list members become users of your site (not a third parties).
Available shortcodes:
[lh_signing_form] (enable signatories on any post, page, or custom post type)
Unconfirmed signatories: [lh_signing_unconfirmed_count]
Confirmed signatories: [lh_signing_confirmed_count]
Total signatories: [lh_signing_total_count]
[lh_signing_unconfirmed_list] (unformated list)
[lh_signing_confirmed_list] (unformated list)
You can customise the display of the signing form ([lh_signing_form]) via a number of shortcode arguments more information is available <a href="https://lhero.org/portfolio/lh-signing/" title="Additional Plugin documentation" rel="nofollow ugc">here</a>

LH Signing

LH Signing allows you to create configurable validated lists like petitions or event sign ups. It is the only self hosted solution in WP

Sequential posts numbering vs LH Signing