Lazarus is a free IDE for FreePascal Compiler. It is Delphi compatible IDE for Linux, FreeBSD, MacOSX and Windows. Free Pascal is a free and open source compiler that runs on Linux, Windows, OS/2, 68K and more. Free Pascal is designed to be able to understand and compile Delphi syntax, which is OOP. Using Lazarus, users can develop Delphi like programs in linux, windows and MacOS platforms. Lazarus and Free Pascal strives for write your code or app in once and you can compile it anywhere.
Install Lazarus on Ubuntu:
It is available as deb package file for Ubuntu. Download the latest deb file from the below link. And install it via Gdebi package installer.