SSI gTasks ToDo is described as 'First offline Task,Todo list application that syncs with Google Tasks' and is an app in the Office & Productivity category. There are more than 100 alternatives to SSI gTasks ToDo for a variety of platforms, including Android, iPhone, Online / Web-based, Windows and Mac. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Evernote. Other great apps like SSI gTasks ToDo are Simplenote (Free, Open Source), CherryTree (Free, Open Source), Habitica (Freemium, Open Source) and Trilium Notes (Free, Open Source).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.
Habitica is a free habit building and productivity app that treats your real life like a game. With in-game rewards and punishments to motivate you and a strong social network to inspire you, Habitica can help you achieve your goals to become healthy, hard-working, and happy.
Take your tasks anywhere with this feature-packed application. See tasks located nearby, add and complete tasks on the go, organize upcoming tasks, and sync it all seamlessly with Remember The Milk. Desktop app available for Pro users. Very good integration in GMail!