CAPitalZ

This plugin creates four (4) seperate RSS 2.0 feeds from posts, comments, pages, and one combined [posts & pages] across all blogs on your site.
Works both on WPMS upto 4.9.20
This will skip the first comment and page of a blog; also will not include private, spam, mature and deleted blogs.
Both Subdirectory and VHOST installations are now supported. Thanks to DaryL.
Features:
<ul>
<li>Generates sitewide combined [posts & pages] feed</li>
<li>Generates sitewide posts feed</li>
<li>Generates sitewide comments feed</li>
<li>Generates sitewide pages feed</li>
<li>Client-side caching via ETag headers</li>
<li>Admin screen to configure options</li>
<li>Compliance with xhtml and xml standards & many more</li>
</ul>
For more explanation and to leave any suggestions to improve or bugs, please visit on my blog : <a href="http://1uthavi.adadaa.com/ada-wpmu-sitewide-feed-plugin/" rel="nofollow ugc">Ada WPMS Sitewide Feed</a>
<h3>Usage</h3>
Compatible with WP Multi-Network plugin . You can have different blog ID than 1 to trigger the full feed.
<h3>To Do</h3>
<ul>
<li>Comply fully for language translation</li>
<li>Exclude blogs by ID</li>
<li>Enable/disable individual sitewide feeds</li>
<li>Option to include the blog title in the post title shown in the feed</li>
<li>Consider changing the function ada_get_avatar_url() to use the core hook get_avatar(). So it can work with WPMUDEV’s Avatars for Multisite.</li>
<li>Option to exclude by post types</li>
</ul>

Ada WPMS Sitewide Feed

Creates four rss 2.0 feeds showing recent posts, comments, pages, and one combined [posts and pages] from all blogs.  Works both on WPMS, and WPMU

Ada Tamil Writer is a powerful plugin that allows you to type in Tamil directly from your WordPress admin area. The plugin adds a custom admin bar menu where you can easily switch between different Tamil keyboard layouts, such as Thaminglish, Tamil99, and Typewriter.
Key features: 
* Quick switch between Tamil keyboard layouts in the admin bar. 
* Multiple Tamil keyboard layouts supported – including Thaminglish, Tamil99, and Typewriter. 
* As admin, you can set the default keyboard layout for the site and visitors can configure their own preference. 
* You can type Tamil directly within many fields of WordPress without installing any Tamil fonts 
* Let your site visitors type Tamil – such as in Comments – without needing them to install anything 
* Customizable settings for logged-in and non-logged-in users. 
* Supports English typing as well. 
* Requires the Classic Editor plugin for optimal functionality. 
* Clean and modern design that integrates seamlessly with the WordPress admin interface.
<h3>License</h3>
This plugin is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

Ada Tamil Writer

Ada Tamil Writer provides easy Tamil typing options in WordPress, with layouts like Thaminglish, Tamil99, and Typewriter.

Ada WPMS Sitewide Feed vs Ada Tamil Writer