HTC One E9+ comes with Google Chrome only, which can sync the tabs you have open on other devices (desktops, tablets) with the phone. This feature also syncs your bookmarks and favorite sites and can remember passwords and login data across different platforms.
The HTC One E9+ comes with Polaris Office 5, which can view and create Word, Excel and PowerPoint files, it can display PDFs too. The app handles files stored locally along with ones in your Google Drive account. The View Together option lets you do a presentation on multiple devices by connecting them together wirelessly.
HTC has skinned the calendar to match Sense 7 looks. Adding an event lets you specify time (with a warning if there's a conflict with another event), who will attend and where the meeting will be held. Multiple online calendars are supported.
HTC Backup can do manual or scheduled backups of your apps, messages (texts and emails), contacts and accounts (mail and social). The data is sent either to Google Drive or Dropbox and you can limit the app to transfer over Wi-Fi only.
The alarm clock application can handle multiple alarms, each with its own start and repeat time. The stopwatch and timer are self-explanatory.
There is a cool Weather app as well, which relies on the AccuWeather services.
HTC Scribble handles drawing and taking notes. You can make cards, lists, diaries, to-do sheets, among others. It supports various type of multimedia content and comes with lots of predefined templates to get you started.
HTC has its own power saving section in settings which works on two levels. The basic power saver lets you reduce brightness and CPU power, and turn off vibration and data. Extreme power saver goes an extra mile and disables other non-vital features like remote lock.
There's a bundled sound recorder on the One E9+ for basic voice memos. The calculator app is the stock Lollipop one with a side swipe from the right for advanced functions in portrait, which are always visible when in landscape.
You can buy an optional DotView case for the One E9+ and the phone comes with an app preinstalled. It offers you a choice of numerous themes as well as additional personalization.