I use Trello to plan and manage software projects as well as a weekly planner to keep track of my work related tasks.

This is a list of my favourite Google Chrome extensions for Trello which make it easier to use:

Scrum for Trello

Adds functionality to estimate and track story points or hours. I wrote a detailed post on this at Trello.com – Estimating & Tracking Hours.

https://chrome.google.com/webstore/detail/scrum-for-trello/jdbcdblgjdpmfninkoogcfpnkjmndgje

CardCounter for Trello

Shows the number of cards in each list at the top right of the list.

https://chrome.google.com/webstore/detail/cardcounter-for-trello/miejdnaildjcmahbhmfngfdoficmkdhi