Some are in Bengali
Project Management
https://play.google.com/store/apps/details?id=com.sitestree.pmp
On CSS
https://play.google.com/store/apps/details?id=com.sitestree.css
On JavaScript
https://play.google.com/store/apps/details?id=com.sitestree.javascript
On PHP
https://play.google.com/store/apps/details?id=com.sitestree.php
On SEO course
https://play.google.com/store/apps/details?id=com.sitestree.seo
SQL Course
https://play.google.com/store/apps/details?id=com.sitestree.sql
Oral Communications
https://play.google.com/store/apps/details?id=com.justetc.oral_communications.workplace
AngularJS
https://play.google.com/store/apps/details?id=com.salearningschool.bangla.angularjs1
HTML
https://play.google.com/store/apps/details?id=com.salearningschool.bangla.html