Nastaleeq (Nastaliq) plugin for Multiling O Keyboard. This is not an independent app, please install OKeyboard along with this plugin.

Instruction:
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⑴ Install this plugin and Multiling O Keyboard.
⑵ Run O Keyboard and follow its setup guide.
⑶ Slide space bar to switch languages.

Please email if you have any questions.

Wikipedia:
Nastaʿlīq (also anglicized as Nastaleeq; in Persian: نستعلیق nastaʿlīq) is one of the main calligraphic hands used in writing the Perso-Arabic script, and traditionally the predominant style in Persian calligraphy.[1] It was developed in Iran in the 8th and 9th centuries.[citation needed] It is sometimes used to write Arabic-language text (where it is known as Taʿliq[citation needed] and is mainly used for titles and headings), but its use has always been more popular in the Persian, Turkic, and South Asian spheres of influence. Nastaʿlīq has extensively been (and still is) practiced in Iran, Pakistan and Afghanistan for written poetry and as a form of art. However, it is harder to read than Naskh.
A less elaborate version of Nastaʿlīq serves as the preferred style for writing Persian, Kashmiri, Punjabi and Urdu, and it is often used alongside Naskh for Pashto. Nastaʿlīq was historically used for writing Ottoman Turkish, where it was known as tâlik[2] (not to be confused with a totally different Persian style, also called taʿliq; to distinguish the two, Ottomans referred to the latter as ta'liq-i qadim = old ta'liq).
Nastaʿlīq is the core script of the post-Sassanid Persian writing tradition, and is equally important in the areas under its cultural influence. The languages of Afghanistan (Dari, Uzbek, Turkmen, etc.), Pakistan (Punjabi, Urdu, Kashmiri, Saraiki, etc.), India (Urdu, Kashmiri, Rekhta), and the Turkic Uyghur language of the Chinese province of Xinjiang, rely on Nastaʿlīq. Under the name taʿliq (lit. “suspending [script]”), it was also beloved by Ottoman calligraphers who developed the Diwani (divanî) and Ruqah (rık’a) styles from it.
Nastaʿlīq is amongst the most fluid calligraphy styles for the Arabic alphabet. It has short verticals with no serifs, and long horizontal strokes. It is written using a piece of trimmed reed with a tip of 5–10 mm (0.20–0.39 in), called "qalam" ("pen", in Arabic and Persian "قلم"), and carbon ink, named "davat". The nib of a qalam is usually split in the middle to facilitate ink absorption.
Two important forms of Nastaʿlīq panels are Chalipa and Siah-Masq. A Chalipa ("cross", in Persian) panel usually consists of four diagonal hemistiches (half-lines) of poetry, clearly signifying a moral, ethical or poetic concept. Siah-Masq ("inked drill") panels, however, communicate via composition and form, rather than content. In Siah-Masq, repeating a few letters or words (sometimes even one) virtually inks the whole panel. The content is thus of less significance and not clearly accessible.

Tips:
This app is useful for exotic tattoo design.
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Photo: Guardian Lake by Romain Guy