If you are ISV or by any reason limited by budget you are probably looking for a free/open source libraries for your development. There are plenty of them amd it’s hard to know which are white and which are black 🙂

So based on my experience I can provide following list for must have from free libraries:

Jedi JCL – quite big and of high quality library provides you with a lot of reusable routines;

Jedi VCL – a tons of different purpose visual and non-visual components (also very high quality code);

Spring4D – a must have library for general development (nullable types, interfaced lists, maps, dictionaries etc.);

DSharp – aspect oriented programming, mocks for unit tests, logging;

DUnitX – also integrated in the recent versions of Delphi for the best unit testing;

LockBox – symmetric and asymmetric ciphers as well as hashes support;

FastMM – for extended memory leak tracking.

56.957659 24.023720