jamiechong

Export 2 Multisite exports your standalone database SQL for import into a WP multisite installation. It handles duplicate users (based on email) and will copy over all site settings including Widgets and Menus. You still need to copy the files for your themes, plugins and uploads.
<ul>
<li>This plugin has been minimally tested, but has been used to successfully migrate a handful of standalone sites to a multisite installation.</li>
<li>There is a good possibility it won’t work for sites that make use of a multitude of plugins – especially plugins that have their own database tables.</li>
</ul>
Installation
<ol>
<li>Create a new site on the Multisite.</li>
<li>Copy the plugins and themes from this standalone site to the Multisite.</li>
<li>Copy the files from wp-content/uploads/ on this site to wp-content/uploads/sites// on the multisite.</li>
<li>Backup the database on the Multisite.</li>
<li>Provide the Site ID of the Multisite. This can be found by hovering the mouse over the new site on Network Admin->Sites.</li>
<li>Provide the New URL. Example: //mysite.my-wp-multisite.com</li>
<li>Provide the New file path (The file path of the Multisite installation).</li>
<li>Export the database dump.</li>
<li>Import the SQL into your Multisite installation.</li>
</ol>
<ul>
<li>Important: The exported SQL will DROP the tables that were created for the Site ID you provided. So only perform this migration on new empty Sites.</li>
<li>Note that the you may need to review the exported SQL to ensure that plugin database tables have been exported correctly.</li>
<li>The site admin (username and password) is the user you created while creating the new Site, NOT the site admin of this standalone site.</li>
<li>The guts of this export plugin were inspired by <a href="https://iandunn.name/comprehensive-wordpress-multisite-migrations/" rel="nofollow ugc">this blog post</a></li>
<li>The code for this plugin has been modified from the <a href="https://wordpress.org/plugins/wp-migrate-db" rel="ugc">WP Migrate DB</a> plugin, but should not conflict with it in any way.</li>
</ul>

Export 2 Multisite

Exports your standalone database SQL for import into a WP Multisite installation.

samwilson

<a href="http://tabulate.readthedocs.org/en/latest/?badge=latest" rel="nofollow ugc"></a> 
<a href="https://travis-ci.org/tabulate/tabulate" rel="nofollow ugc"></a> 
<a href="" rel="nofollow ugc"></a> 
<a href="" rel="nofollow ugc"></a> 
<a href="https://wordpress.org/plugins/tabulate" rel="ugc"></a> 
<a href="" rel="nofollow ugc"></a> 
<a href="https://github.com/tabulate/tabulate/blob/master/LICENSE.txt" rel="nofollow ugc"></a> 
<a href="https://scrutinizer-ci.com/g/tabulate/tabulate/?branch=master" rel="nofollow ugc"></a>
This plugin provides a simple user-friendly interface to tables in your database. 
Somewhat akin to phpMyAdmin, but easier to use and more focused on end users.
The documentation can be found at <a href="https://tabulate.readthedocs.org/" rel="nofollow ugc">tabulate.readthedocs.org</a>.
Features (in no particular order):
<ol>
<li>Tables can be filtered by any column or columns, and with a range of 
operators (‘contains’, ‘is’, ’empty’, ‘one of’, ‘greater than’, ‘less than’, 
and the negations of all of these). Multiple filters are conjunctive 
(i.e. with a logical and).</li>
<li>Access can be granted to read, create, update, delete, and import 
records in any or all tables. (This can be done by anyone with the 
promote_users capability.) Access can also be granted to anonymous users.</li>
<li>CSV data can be imported, with the UI supporting column mapping, data 
validation, and previewing prior to final import. If an imported row has a 
value for the Primary Key, the existing row will be overwritten.</li>
<li>Data can be exported to CSV, including after filters have been applied. </li>
<li>A quick-jump navigation box is located top right of every page, 
and can also be added as a Dashboard widget.</li>
<li>Records in tables with date columns can be viewed in a calendar.</li>
<li>Entity Relationship Diagrams (drawn with <a href="http://graphviz.org/" rel="nofollow ugc">GraphViz</a>) 
can be automatically generated, with any specified subset of tables. Foreign 
keys are displayed as directed edges. This feature is only available if the 
<a href="https://wordpress.org/plugins/tfo-graphviz/" rel="ugc">TFO Graphviz plugin</a> is installed.</li>
<li>All data modifications are recorded, along with optional comments that users 
can provide when updating data.</li>
<li>The <code>[tabulate]</code> shortcode can be used to embed tables, lists, row-counts, 
and data-entry forms into WordPress content. For more details, 
<a href="https://tabulate.readthedocs.org/en/latest/shortcode.html" rel="nofollow ugc">read the documentation</a>.</li>
<li>Tables with point columns can be exported to KML and OpenStreetMap XML. 
Also, data entry for these columns is done with a small slippy map, on which 
a marker can be placed.</li>
</ol>
Development is managed on GitHub 
at <a href="https://github.com/tabulate/tabulate" rel="nofollow ugc">github.com/tabulate/tabulate</a>

Tabulate

Manage relational tabular data using the full power of your MySQL database. CSV import/export; access-control; foreign-keys; and lots more.

Export 2 Multisite vs Tabulate