I like and use, frequently:
Invoiceable (free) simple online invoicing, no limits that I see or need to get around
http://invoiceable.co
Toggl (free) time tracking, very slick and easy for multiple clients
http://toggl.com
Google Keep (free) create and save notes of all kinds, get reminders, color code, search for notes and sync with the mobile app (not as feature-rich as Evernote, but really simple and not overwhelming)
https://keep.google.com/