Open Source Software for PHP
Statamic
Statamic is a flat file based content management system written in PHP. With Statamic you can build better and faster websites that are easy to manage. Statamic features over 40 field types, drag & drop navigation builder, revision and content history, inline content editing, asset management, plugin architecture and real-time collaboration that makes content management a breeze.
Tiki Wiki CMS Groupware
Tiki Wiki CMS Groupware is a free and open-source content management system and Wiki software. Tiki has been downloaded over a million times by businesses, governments, non-profits and individuals worldwide to take advantage of its flexibility and customizability to deliver a broad range of web applications and wikis.
Hack
Developed by Facebook as free and open-source dialect of PHP, Hack is a programming language for the HipHop Virtual Machine. Hack is licensed under the MIT License and allows developers to use both dynamic typing and static typing.
ownCloud
With ownCloud, organizations can collaborate and be more production on their own secure enterprise file sharing (EFSS) platform. The ownCloud platform is self-hosted and allow for secure file sharing within an organization. The platform can be hosted on premise or on a cloud instance, controlled by the organization. The software is written in PHP and Javascript and is fully open source, released under the AGPLv3 license. ownCloud can run on most server hardware and operating systems, and the client for accessing ownCloud is available for Android, iOS, macOS, Linux and Windows.
Adminer
Adminer provides administrators, developers and website maintainers with a full-featured database management tool written in PHP. With Adminer you can to a database servers with username and password. List fields, indexes, foreign keys and triggers of table. Change name, engine, collation, auto_increment and comment of table. Alter name, type, collation, comment and default values of columns. Create, alter and drop indexes, foreign keys, select form view and call stored procedures and functions. The software is distributed under the Apache License which makes it free and open-source. Adminer supports a wide variety of relational and NoSQL databases including MySQL, MariaDB, PostgreSQL, SQLite, MS SQL, Oracle, Firebird, SimpleDB, Elasticsearch and MongoDB.
Saaze
An all-inclusive, flat-file CMS for simple and fast content management. While regular content management systems like WordPress are great, the complexity of running sush a site can easily become a burden. They also have a larger attack vector due to popularity and the fact that they utilize a relation database mangement system to serve and manage the content. Saaze is fundamentally different, the flat-file architecture of Saaze makes hosting content for the web easy to manage, secure and fast to load.
Elgg
Elgg is an award-winning open source social networking engine that provides a robust framework on which to build all kinds of social environments, from a campus wide social network for your university, school or college or an internal collaborative platform for your organization through to a brand-building communications tool for your company and its clients.
HumHub
HumHub is a free and open-source social network software and framework built to give you the tools to make communication and collaboration easy and successful. HumHub is designed to be lightweight, powerful and comes with an user-friendly interface that is easy to use both for users of the social network and administrators.
Nubo
Nubo is a self-hosted file sharing application that runs on macOS, Linux and Windows (64-bit versions only). The application consists of two parts, a cloud-base part which is s mall PHP application that must be installed on a server, and the client which can should be installed on your local machne to be able to syncronise and share with the cloud. In that sense Nubo is similar to other file sharing solutions in that you drop files into a special folder on your computer to save and sync with cloud instance.
Yii Framework
Yii is a fast, secure, and efficient framework written in PHP. The framework is flexible yet pragmatic and works right out of the box with resanable defaults. With the Yii framework you can write more code in less time with simple with a powerful APIs and that include terminal commands for code generation for quick skaffolding. Yii is released as free and open source software under the liberal MIT License.