ExpressionEngine 2, ExpressionEngine 3, ExpressionEngine 4, ExpressionEngine 5
Avast ye landlubbers! Make yer website talk like a pirate!
ExpressionEngine 3, ExpressionEngine 4
MX Email From Template is add-on which helps you to send emails right from EE template, with variable replacement, default to/from addressing, entity decoding, HTML/multipart emails, attachments and more!
The MX Notify Control extension allows you to send customized notifications by emails/PMs based on different triggers - new entry creating/updating, member registration, member validation etc..
Smart Cache will allow you to modify any .js or .css files while in development or production, and force the browser to fetch the file anew. No more will you have clients saying the site is not working, only to find out they needed to delete their cache.