Pen and Paper
When freelancing and before many options came out program wise I would always implement the pen and paper concept. The process I chose was to create a graph style list that focused on the task, importance, priority level, difficulty, estimated time to complete task and date completed. When I complete a paper checklist I try to measure my success rate and complete all the fairly easy tasks first. This is important because when you visually
see the tasks you have completed you feel a sense of joy knowing that your project is almost complete and it helps when working on the longer time consuming tasks.
Dry Erase Board
Before computers, apps, and mobile devices in the shop I worked at we purchased two 4' x 8' dry erase boards and monitored each task and attempted to keep it up to date as best as possible but actually trying and executing this process was timely and messy. Eventually we had to implement a certain workflow procedure on who could update and what they were
allowed to update.
When freelancing on my own I moved my pen and paper idea to an excel spreadsheet and created a macro to measure the time frame to track my process and what areas I needed improvement. This is an out-dated option but still an effective one. If I was subcontracting out some code to a friend I would use Google drive to share the spreadsheet.
By far my favorite workflow to do list tracking. It does have a free and paid option. The free option is great for individuals maintain their lists or in this case they are known as boards and each task or list item is known as a board. You are allowed to migrate files from Google, Dropbox, and your computer. I love the simplicity of this compared to all app options and how I can use it on my iPad, iPhone, Android and desktop but there are some areas of improvement it could use.
Excellent option for programmers and large companies. It offers video chat and a ton of more features than Trello. However, all the features and options for a single user are overwhelming and from a designer mentality I find it difficult to work within. If I were ever a large 20 team crew I would certainly go this route. There are some free options and the paid membership appears to be cheaper than Trello. I haven't checked to see if this is offered for iPad, iPhone or android.
I haven't used or tested this option but the site seems pretty cool and I wanted to offer another suggestion so to not appear biased. There is a paid version and free version available. It also shows that its offered for iPhone, iPad, Android, Mac, and Windows.
I also did a search for alternatives to Trello if any wants to explore outside the listed above.