List of Site level Features on SharePoint 2013 and Office 365

• Announcement Tiles
  
  This feature enables Announcement Tiles feature and adds the web part to the site.
  
  
• Community Site Feature
  
  This feature adds community functionality such as discussion categories, content and people reputation and the members list. It also provisions community site pages that contain these lists and features.
  
  
• Content Organizer
  
  This feature creates metadata based rules that move content submitted to this site to the correct library or folder.
  
  
• Duet Enterprise - SAP Workflow
  
  This feature enables the site to host SAP workflow task types.
  
  
• Duet Enterprise Reporting
  
  This feature retrieves data from the SAP System and generates reports. You can also create and save report settings to generate reports depending on your personal preferences.
  
  
• Duet Enterprise Site Branding
  
  This feature enables a Duet Enterprise logo to appear as the site logo.
  
  
• External System Events
  
  This feature enables Alerts and Event Receivers on the External List and External Content Types.
  
  
• Following Content
  
  This feature enables users to follow documents or sites.
  
  
• Getting Started
  
  This feature provides a tile view experience for common SharePoint site actions.
  
  
• Getting Started with Project Web App
  
  This feature creates an instance of the Promoted Links list with items about how to get started with your Project Web App site.
  
  
• Hold
  
  This feature tracks external actions, like litigations, investigations, or audits that require you to suspend the disposition of documents.
  
  
• Metadata Navigation and Filtering
  
  This feature provides each list in the site with a settings page for configuring that list to use metadata tree view hierarchies and filter controls to improve navigation and filtering of the contained items.
  
  
• Minimal Download Strategy
  
  This will enable a technique that delivers a faster and more fluid page navigation experience, in pages and site templates that support it, by downloading and rendering only those portions of a page that are changing.
  
  
• Mobile Browser View
  
  This feature provides Document Library and other lists in team site with mobile view for smartphone browsers.
  
  
• Offline Synchronization for External Lists
  
  This feature enables offline synchronization between external lists and Outlook.
  
  
• Project Functionality
  
  This feature adds project management functionality to a site. It includes tasks, a calendar and web parts on the home page of the site.
  
  
• Project Proposal Workflow
  
  This feature provides a review workflow for managing project proposals.
  
  
• Project Web App Connectivity
  
  This feature provides the lists required within a Project Site for integration with Project Web App including issues, risks, and deliverables.
  
  
• SAP Workflow Web Parts
  
  This feature enables the usage of SAP Workflow Web Parts.
  
  
• Search Config Data Content Types
  
  It installs content types designed to manage search config.
  
  
• Search Config Data Site Columns
  
  It installs columns designed to manage information about search configurations.
  
  
• Search Config List Instance Feature
  
  It creates a search config list instance that provisions a list to enable the import and export of search configurations.
  
  
• Search Config Template Feature
  
  It creates a search config template that provisions a template for the search config list to enable the import and export of search configurations.
  
  
• SharePoint Server Enterprise Site features
  
  Features such as Visio Services, Access Services, and Excel Services Application that are included in the SharePoint Server Enterprise License.
  
  
• SharePoint Server Publishing
  
  It creates a web page library as well as supporting libraries to create and publish pages based on page layouts.
  
  
• SharePoint Server Standard Site features
  
  Features such as user profiles and search are included in the SharePoint Server Standard License.
  
  
• Site Feed
  
  It enables the use of site feeds.
  
  
• Site Mailbox
  
  The Site Mailbox app helps you keep email and documents close together by connecting your site to an Exchange mailbox. You can then view your email on SharePoint and view site documents in Outlook.
  
  
• Site Notebook
  
  This feature creates a Microsoft OneNote 2010 notebook in the Shared Documents library and places a link to it on the Quick Launch. This feature requires a properly configured WOPI application server to create OneNote 2010 notebooks.
  
  
• Team Collaboration Lists
  
  It provides team collaboration capabilities for a site by making standard lists, such as document libraries and issues, available.
  
  
• Wiki Page Home Page
  
  This site feature will create a wiki page and set it as your site home page.
  
  
• Workflow Task Content Type
  
  This feature adds the SharePoint 2013 Workflow Task content type to the site.
  
  
• Workflows can use app permissions
  
  This feature allows workflows to read from and to write to all items in this site.

Here we have all the site level features for your reference under one article so you need not waste your time and effort.
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Cheers!