Alperen is a complex but easy-to-use Prayer Times Calculator and Adhan Reciter.

Alperen Features:
1. All timings between 1901 and 2099 by truly astronomical calculation
2. 5 different calculation algorithms
3. Parametric depression angles and safety margins
4. Enter latitude/longitude manually with a resolution of 0.01
5. Or choose your city from a database of 6500 cities all over the world
6. All prayer and makrouh times, Hanafi and Shafi Asr calculation
7. Hijri calendar
8. Lists Holy Days of the year, also reminds beforehand
9. Qibla angle and compass drift
10. Graphical display of sun/moon azimuth & elevation angles and trajectory
11. World Qibla map
12. Real-time display and dynamical wallpapers of moon/earth/globe view
13. Real-time earth illumination map showing all prayer/makrouh zones
14. Annual Prayer/Makrouh Timing Map
15. Notifies sun/moon eclipses
16. Monthly/yearly Prayer/Makrouh Timing List
17. Some astronomical values in real-time
18. Automatically recites adhan / opens files at the prayer time
19. Different adhan can be selected for each prayer
20. Parametric fajr adhan timing
21. Asr adhan at Hanafi or Shafi timing
22. Recites "dua after adhan" and displays its interpretation
23. Recites "salawaat" before Friday prayer or at Predawn
24. Parametric salawaat timing
25. Can wake up computer before adhan/salawaat
26. Displays the time remained to the next prayer/makrouh timing
27. Warns with message/salawaat before end of prayer / start of makrouh time
28. Tally keeping module
29. Easy access from the system tray icon
30. Messages can be displayed as message-box or balloon
31. Tooltips on forms
32. Correct PC clock automatically by connecting to internet time-servers
33. Whitepaper about definition & calculation of prayer timings

Run the EXE file. A mosque-shaped icon will appear on the system tray (to the lower-right of the screen).
1. If you place your mouse over this icon, you will see the remaining time to the next prayer/makrouh timing.
2. If you left-click this icon, a window will be opened, always on-top, which displays the remaining time on its title bar. The window will be closed by left-clicking the icon again.
3. If you double-click this icon, you can hide or show the desktop icons. Especially when you use the dynamic wallpapers, hiding the icons will result in a more "cleaner" view.
4. If you click the icon with the middle button (wheel), you can mute the WAV file played.
5. By right-clicking the icon, a pop-up menu will be opened, by which following controls can be accessed:

The license of this software is Freeware, you can free download and free use this calculator software.