Some usefull links
http://sourceforge.net/projects/bgra-controls/?source=recommendedBGRA Controls is a set Open Source UI components for Lazarus IDE. It includes custom buttons, labels, panels, progress bars, and others. It also comes with a full Custom Drawn drawer, games and more. These components needs bgrabitmap from here
http://sourceforge.net/projects/lazpaint/files/src/ before you install BGRA Controls
http://www.tkweb.eu/en/delphicompKControls is a freeware distribution, a flagship of tkweb. It contains all of my published components for Delphi and Lazarus. All controls have been written with the aim to become both cross-IDE compatible (Delphi/C++Builder VCL and Lazarus LCL) and cross-platform compatible in Lazarus.
http://sourceforge.net/projects/zeoslib/The ZeosLib is a set of database components for MySQL, PostgreSQL, Interbase, Firebird, MS SQL, Sybase, Oracle and SQLite for Delphi, FreePascal/Lazarus, Kylix and C++ Builder.
http://sourceforge.net/projects/eccontrols/Set of visual for components for FPC/Lazarus based on Themes. Contains ruler, position-bar, image menu and visually atractive alternatives to TTrackBar, TProgressBar, TCheckBox, TRadioGroup, TCheckGroup, TSpeedButton, TEditButton, TColorEdit, TFloatSpinEdit and TUpDown with some extra options
http://sourceforge.net/projects/glsceneGLScene is an OpenGL based 3D library for Delphi, C++Builder and Lazarus. It provides visual components and objects allowing description and rendering of 3D scenes in an easy, no-hassle, yet powerful manner.
http://www.benibela.de/components_en.html#top a few components
http://indyproject.org/Sockets/fpc/index.en.aspxIndy is a set of client and server components for using internet protocols, such as TCP, UDP, echo, FTP, HTTP, Telnet, and many others
Maybe you know some free components for Lazarus?