I want to find free apps/websites where I can collect my ideas thought
In the form of flow chart, notes etc
Which can be interconnected/linked for better understanding
& also put images links etc
To manage myself
Like mural.ly ,MindMap,Evernote

For what platform? PC, Android, IOS, Blackberry?

For both PC & Android which can b used online/offline

You can try
Blumind
XMind: Professional & Powerful Mind Mapping Software
List of concept- and mind-mapping software - Wikipedia, the free encyclopedia

For Android:
The top five mind mapping apps for the Android tablet - TechRepublic