This app was mentioned in 7 comments, with an average of 1.71 upvotes
There is a 3rd party Omnifocus client for Android called FocusGTD. It syncs with the Omnicloud server, so you can add the Omnifocus inbox, check off actions and even edit them.
I have a Macbook, but all other devices are Windows/Android. I use FocusGTD for Android and have had no problems at all with it syncing to Omnifocus on the Mac. In case anyone else here is in the Macbook/Android world with me. It is also now all fancy with the Material Design.
I know it isn't a Windows solution, but it is part of how I do things. I use a combination of Evernote and Omnifocus though, so I'm usually pretty on point through Evernote when I am only connected to Windows.
Also, I write everything down still. So many notebooks in my office, each with a dizzying array of information and notes. But it all makes sense in my head at least.
Daily To-Do List - I make a physical to-do list every day, then convert things to digital and separate by client as I go. At the end of each day, I make tomorrow's list and prioritize it. I learned not to trust myself to remember anything.
Evernote notebooks - I create an Evernote notebook for each client and then make notes of everything. I do this more as a catch-all/inbox, but also to archive notes and summaries of events/meetings. I can also copy/clip things from the web as needed. Also, utilize tagging in Evernote for quickly finding things.
Gmail labels - I set up filters so each mail from a client gets auto-labeled and color coded. This makes scanning my inbox lightning fast. I will star important things and use Google Inbox to re-send/remind me of important emails. I set up more filters to auto-archive things I need to have, but not really read. Daily summaries, and software update types of things, etc. Then I have them in the label's archive, but I don't get notifications and they are marked as read. Keeps me from wasting time with them.
Dropbox folders - I use Dropbox for everything. In there, each client gets a folder of their own and I created a very good labeling system to be able to locate any file very quickly. I have Dropbox synced with Google Drive so all of my files are anywhere I need them anytime. Don't underestimate labeling things well and don't skimp on cloud storage plans. Be able to save everything. I have several hundred GBs of storage and hate the idea of deciding if I should keep something based on space.
Physical notebooks - Each client gets their own notebook. I take notes when talking or during meetings. When things get messy, I take pages out of notebooks and each client also has a manila folder to archive physical documents. Then I know any client's notes are either in their notebook or their folder.
Omnifocus projects - On my Macbook, I also use Omnifocus as my work to-do application. I use the clients as Projects in there and use contexts accordingly. Since I don't use an iPhone/iPad but love this software for the Mac, I have found that Focus GTD does a great job of syncing things to my Android devices. I use this to break down each client's tasks into small, actionable steps. This is not for big picture or general ideas, but for specific tasks that I can do.
I used Asana pretty heavily for awhile, but I really prefer non-web apps if I can get them. I would say the same thing about Trello. Both fantastic pieces of software, just not in my current workflow very much.
Everything is a bit of my own personal GTD system, but I've been tweaking it and customizing it for awhile now. I have tried every to-do list, note taking app, and task management system there are and would comfortably recommend any.do, Todoist, Omnifocus/Focus GTD, Evernote, Google Keep, Trello, Asana, and Jira. Try them all and see what you think.
I use Jira with one client and none of my others use it, so no matter how good your system is, clients may come in and change your system for you. But the stronger your system is, the easier it will be to adapt when someone comes in and says "we do it this way, we'd like you to also..." Just find what works for you and commit to it.
tl;dr - Gmail labels, Evernote notebooks, Omnifocus/to-do apps, Dropbox (save everything) and have a ~~good~~ great file labeling system. Find a to-do list app that you like and commit to it. Carry a notebook. Find a system and commit to it.
You can get a Jira starter license at $10/year, allows up to 10 users.
If you're running Mac, the most amazing program is Omnifocus. On Android, I pair it with Focus GTD. The file is encrypted. They do provide free syncing with their product, or you can run your own WebDav server.
An alternative to Omnifocus that I haven't tried is called Tracks. It looks pretty slick.
If you do decide to stick with Omni, try Focus GTD for Android. Works great for me.
https://play.google.com/store/apps/details?id=com.burgstaller.android.focusgtd
MacBook Pro and Android user. No real issues. However, as you enter the macos ecosystem, you're going to find apps that you like on macos, and find that they only have a counterpart on ios. Or if there is an android counterpart, it's 3rd party. A good example of this for me is omnifocus. This is the best todo organizer/GTD manager I have ever come across. They do not provide an android app and have no plans to do so. Fortunately, there is focus gtd which works with it. It is mostly working now, but when I first started, it had a lot of issues with syncing and encryption. Another such app is DayOne which does not have an android app. Granted, I no longer recommend DayOne due to their switch to subscription model.
For me, I do a lot of development. macOS is this perfect merger of development environment and "corporate office apps" such as outlook, excel, webex, and powerpoint. I had macbooks as work laptops for about 4 years, and when my company stopped supporting them, I bought my own MBP and am now BYOD for work.
Hi, I have not tested it but there is a native, Android app that syncs with OmniFocus: https://play.google.com/store/apps/details?id=com.burgstaller.android.focusgtd&hl=en