Want to improve your CodeIgniter skills? Well, these top Opensource CodeIgniter projects will help you do so. They are easy to install and use, thanks to the detailed documentation. Let’s see how they stack up.
Easy appointments

If you want an open-source appointment scheduler, this software is your perfect bet. Being open-source, you can install it on your server and use it on your personal projects. The best part, you can synchronize it with Google calendar. This means customers can easily book appointments.
Invoiceplane

This open-source application handles your payments, invoices, and customers. It has been in use since 2014, receiving regular updates from the development team. As such, you can expect it to work as other premium invoice software.
Grocery Crud

This Codeigniter framework enables the creation of a CRUD system. You don’t need to customize the JS and CSS files to create the system. It is easy to automate with only a few lines of code. You’ll love its browser compatibility, customization, and themes.
Ecommerce Codeigniter Bootstrap
If you want a functional shopping cart, this Codeigniter Bootstrap is the perfect fit for you. It is responsive, browser compatible, and multi-vendor. As you’d expect, it is highly customizable to your liking.
Ci Phpunit Test

The application enables the combination of PHPUnit and Codeigniter 3. x. it comes with rich documentation for easier usage and all functions are testable. With it, forget modifying Codeigniter files; you use it as it is.
Ci_bootstrap_3
Want to create a full website with one application? Well, get yourself this app. It allows you to create the frontend, admin panel, and API. It has a modular design thanks to the HMVC extension.
Codeigniter Aauth
This authorization and user management application works with Codeigniter 3. x and 2. x. it makes crucial tasks such as login and access operations a walk in the park. You also get advanced features such as public access, grouping, and more.
Codeigniter Composer Installer
It installs Codeigniter 3 via Composer for more secure installation. To update the system folder, you just need to input a single command. To use it, you need PHP 5.3.7 or higher, Composer command, and Git.
Admin Panel User
This application shows how the admin panel works through Codeigniter. The repository comes with all basic and advanced admin controls, such as login, password changes, and more. You don’t need to code any functionalities, just add it to your project.
Datatables

This library handles server-side processing for any database in a fast way. It is easy to use, creating JSON files using few code lines. It can also handle complicated queries and support SQLite and MySQL. You can use it with Codeigniter 3, Prestashop, and Laravel, among others.
Starter Public Edition 4
If you want to learn PHP, this repository will get you started. With lots of beginner PHP concepts, you’ll grasp PHP in no time. All you need is PHP 7.2.5 or higher and Apache 2.2/2.4.
Identity Card
This application retrieves identity card data for People’s Republic of China citizens. It shows proof of ownership of the card at hand.
Playground
This intuitive playground helps you learn Codeigniter 4. It covers some of the most common web application tasks.
Startblog
If you want to start a simple blog, you can use this repository.
Luthier Ci

It contains Codeigniter 3 improvements, making the development of websites and APIs a walk in the park.
Codeigniter Jwt Sample
It allows for the simple implementation of CodeIgniter 4 JWT. You need a WAMP or XAMPP server to use this repository.
Lemper
This LEMP/LNMP stack manager works with Ubuntu cloud or Debian. It is also compatible with on-premise and virtual servers.
Codeigniter Angularjs App
This is an app built with Angular JS and CodeIgniter. To get started, you need to import the SQL files to a database.
Final verdict
These are the top 20 CodeIgniter projects. They range from tutorials, frameworks, to playground spaces to learn to code. Most receive regular updates, while others allow you to use their source code for your projects.