FPC/Delphi asynchronous non-blocking socket server component required

I need an asynchronous non-blocking socket server component to replace ICS twsocket for my application. - Memory leak free and stable. - Support ipv4 and ipv6. - Support Unicode. - Able to compile using Lazarus/FPC and Delphi 7. - Able to work in Linux/Win32/Win64. - Able to work well with multicore processors. - Support up to 50 concurrent client connections. You can use open source. A demo console based multi-threaded client/server for stress testing purpose and test of performance is required. This demo must compile using Lazarus and D7. Source code must be uploaded during the final testing stage for QC - all my projects are successful to date, so you can be assured of your rights. Thanks.