Vadim Bogaiskov

Media file (image) does not contain field for title attribute, only for alt attribute.
Plugin add text into title attribute from alt attribute when image is inserted into post if title attribute is empty.
As alternative see plugin <a href="https://wordpress.org/plugins/restore-image-title" rel="ugc">‘Restore Image Title’</a> by Les Bessant. 
The ‘Restore Image Title’ inserted the post title into title attribute.

Title like Alt

Restores the title attribute from Alt attribute when images are inserted into posts

julian.weinert

WARNING FOR VERSION 1.4 USERS: PLEASE UPDATE TO THE LATEST VERSION!
Hover Image makes you able to add hover-images to your WordPress Posts and Pages. 
Simply use the shortcode [himage] [/himage] and place two images inside. 
The first image can be hyperlink, this will be used for the “himage” too.
If you like Hover Image and wanr to use it in your language, feel free to contact me to create translations! Thanks

Hover Image

Hover Image provides an easy-to-use functionality to change image on hover.

Title like Alt vs Hover Image