[Android Apps and Games] PDApps:
In short, Kanbani is a robust and absolutely free (+ ad-free) task management app. Why not just use Trello or JIRA, you ask? Let us go straight to the point:

It allows to mix online and offline work, either alone or in a team, and sync to our servers or your own.

It has a fine-tuned user interface with bulk commands (create, share, delete, etc.), gestures and 1-tap pie menus – something that Trello still cannot do.

It can turn kanban boards into a traditional calendar-based organizer with the unique Timeline view – because a calendar sometimes does work better.

Trivial like file sharing, it can share boards for any web browser on any platform (example). The viewer is open source (MIT), no registration (QR code based sharing), plugins written in PHP and JavaScript, various import/export options (CSV, text, Trello, etc.), filters, print and vertical view (great for reviewing big boards on laptop), table of contents - and really lightweight (CSS+JS=30K). Check the README with screenshots for details.

Lets you organize text notes into cards or keep a journal with the convenient full-screen Description editor,

Every list can be customized individually with a rich set of settings: archive cards automatically on threshold, sort by Due Date, sync when an event occurs, show Description excerpts and so on.

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Kanbani has been intensively tested to be fast even with great number of cards (thousands), lists, boards and descriptions (100,000+ symbols, per card). I personally have 1500+ cards, 500+ KB of JSON if exported.

But the best part really is collaboration and tinkering for power users and enterprise:

Create and join teams by sharing sync profiles as simple QR codes.

Sync over Wi-Fi, Bluetooth, email, etc. using standard Android Sharing. Paranoids can also sync using just SD cards :laugh:

Encrypt sync data end-to-end with industry-standard cryptography (AES), verifiable using openssl: https://github.com/PDApps/KanbaniDataPHP/blob/master/sync.php#L75

Staying away from vendor locks and centralized services – host your own sync server if desired.

Write online viewer plugins in PHP and JavaScript. Integrate Kanbani into your workflow thanks to the documented data format: receive JSON, transform and feed back. See the in-app help for details and actual code.

We got standards all around: JSON, VCS/ICS, SHA/AES, SFTP (any Unix server), WebDAV (great for multiple concurrent users – supported by OwnCloud, NextCloud, Apache’s mod_dav and various cloud providers).

Wary users may obtain an APK without Google’s analytics ("Community" version) from this thread or the Kanbani’s homepage.

There are also dark theme, autosaving, widgets and more – check the app for details. Android 5+.

I am one of the Kanbani developers. Your suggestions and bug reports are more than welcome! Please post them here or send to kanbani@pdapps.org (or via our website).

Kanbani Web Viewer’s source code on GitHub. Sample Welcome Board.

PHP classes to read and write Kanbani data.

Kanbani’s home page with in-depth manual.

Kanbani’s Google Play page.

Kanbani’s Huawei AppGallery page.