Good plugin ideas for Wordpress

I am trying to extend my knowledge and experience in building Wordpress plugins and now I am looking for good ideas for development. Would be really nice if you have any input on plugins that you think should be developed.

Instagram graph API - is there a wordpress plugin?

I received a client request for a fix after the Instagram API update in December killed existing plugins. However, I am stunned that no solution yet exists. Is it true that there is no working plugin for Wordpress that works with Instagram hashtag s...

How can I keep plugin's scripts and stylesheets from loading in every page?

How can I keep scripts and stylesheets that plug-ins use from loading in every page? For example, I have an email contact form plug-in that uses JavaScript for checking and rendering error messages and some stylesheets for styling its forms. The prob...

Is WordPress the best CMS in the world?

Is WordPress the best CMS in the world?

How to Fix ‘Another Update in Process’ Error in WordPress

Create WordPress custom post type with its own table?

I'm familiar with creating custom post types using WordPress API which uses default wp_posts table to store the data. What I'm trying to achieve is to create a new table, a clone of wp_posts table with additional columns required for my custom post t...

How to make PHP code in WordPress app safe from being edited by someone.

I am working on an app in WordPress in which i have to make some limitations on functionalities. Those features or functionalities can only be unlocked completely if user buys our premium app. But if some developer downloads free version and removes...

Wordpress + ACF (advanced custom fields) Plugin = Future?

Does WordPress have to unite (or create similar as a part of core) with ACF plugin (advanced custom fields plugin, with repeaters, color pickers, google maps etc)