Who are the people who help and support Tom Robinson in the pursuit of achieving justice as well as his family?How do they help?

Judge Taylor made the choice to appoint Atticus to the case, usually the other defense attorney in town received the cases like this one.

Heck Tate helped by realizing while he was on the stand that the marks Mayella had when he first saw her were not marks that Tom Robinson could have given with a crippled arm. At that point of elucidation, Heck asked Atticus while Atticus was questioning him if he could describe the nature of her injuries. This was something Atticus hadn't planned for and it helped the defense.

Link Deas interrupts the trial and shouts out in front of everyone what a good moral and steady employee Tom has been. This is not legal for him to do. He put himself in harm's way by saying what he said. Futhermore, he offers Helen a job after Tom goes to prison.

Atticus Finch obviously helped him by defending him with all him intellect in the trial.

The Negro community collected an additional offering to support the Robinson family and they gave a great offering to Atticus Finch showing their appreciation for his effort.