CustomExtra is a Custom Manager Page with 5 additional objects in separate tables:

• CustomExtraItem,
• CustomExtraOrder,
• CustomExtraOperation,
• CustomExtraMedia,
• CustomExtraLink

You can change number of tabs and rows for all tables in sistem settings.
Rows can be: Number (int), String (varchar), Textarea (text) or Checkbox (tinyint).

It may be a simple form


Or structured form with many fields


Objects can be used in your own snippets or plugins. For example:

<?php
$modx->addPackage('customextra', $modx->getOption('core_path').'components/customextra/model/');
$request = $modx->newObject('customExtraOperation');
$request->set('name', $_POST['name']);
$request->set('string1', $_POST['contact']);
$request->set('description', $_POST['text']);
$request->save();
return true;

To show objects In frontend you can use pdoResources:

[[pdoResources?
  &class=`customExtraItem`
  &loadModels=`customextra`
  &sortby=`id`
  &where=`{ "active":1 }`
  &tpl=`tpl.items`
]]