GreenBanan

Use: for to add “pretty contact” link, you should use bbcode like <code>[user type="%TYPE%" name="%NAME%"]</code>, where:
<ul>
<li><code>%TYPE%</code> – is the type of social-network. Оther types: deviantart, dribbble, facebook, forrst, github, habrahabr, lastfm, mymail, myspace, rutube, twitter, vimeo, vk, youtube.</li>
<li><code>%NAME%</code> – is a user name (identity) in a chosen network.</li>
</ul>
For developers: for to add a new social network in the list, you should edit JSON file which is called “rules.json” (plugin folder), in a certain way:
<ul>
<li>Value pairs <code>"%network_name%":"%URL%"</code> are hold there. You need to add a new couple in the file according to the JSON-standards.</li>
<li>You should put an icon of 16×16 sizes in the format png named <code>%network_name%.png</code> in the icon folder.</li>
</ul>
(%URL% is to consist of constant %UN%, which later will be changed to username) 
For example, for to add a network with the name <code>sky</code>, which addresses on personal pages look like так GreenBanan.sky.com, you need to add a pair <code>"sky" : "http://%UN%.sky.com"</code> and a picture <code>sky.png</code> (see above)
Under Development are:
<ul>
<li>the form of automatic and semi-automatic addition to a new social network;</li>
<li>the promotion of the list of the networks; </li>
<li>the translation of plugin if interface to other programming languages </li>
<li>an addition of the button into editing program</li>
</ul>
Contacts:
@Pup_V, vk.com/greenbanan, nikon@mediamara.by

Pretty Contact

The plugin transforms a link in a pretty and shorted one by means of bbcode.

Dan Griffiths

Widgit

Simple Attribution is just that… simple! It adds a meta box on post pages 
which allows bloggers to specify the name and URL of the site a sourced article 
originated from. Assuming both these fields are filled out, it appends the 
attribution link to the bottom of the post.
Simple Attribution allows links to be generated in both text and image form, 
allowing you to customize it to the feel of your website. Natively, it includes 
5 icons which can be used to identify the attribution link instead of the 
standard caption (which is editable through the options panel), and custom 
icons can be used as well.
Don’t like where we put the link? You have the option to disable 
auto-attribution and put the link wherever you want it to display simply by 
adding <?php echo display_attribution(); ?> to your template!

Simple Attribution

I used it on newly installed wordpress 5.8 with default theme.
The problem is that, it didn't save the attribution title and url and also didn't show the links at bottom of the post.

I wish it work on new version. If it has git page, I can resolve it.

Thanks.

Didn't work on standard wordpress 5.8

A simple plugin to allow bloggers to add attribution to sourced posts.

Pretty Contact vs Simple Attribution