My Nokia E63 additional application as follow :

1. YMTiny (YM Only)
2. Yamee (YM Only)
3. Slick (Yahoo, ICQ, AIM, MSN, GTalk, Jabber, Facebook)
4. eBuddy (Yahoo, Facebook, GTalk, MSN, Jabber)
5. NimBuzz (Yahoo, Facebook, GTalk, MSN, Skype, AIM, ICQ, Orkut)
6. Palringo (Yahoo, Facebook, GTalk, MSN, Twitter)
7. Gravity (for Twitter and Facebook)
8. Opera Mini, Skyfire, Bolt, UC Web (Browser)
9. Nokia Mail Exchange
10. eMoze (Push Mail)
11. X-Plore (like Windows Explorer)
12. JBTask (like Task Manager)
13. NetQin Security and Antivirus also Call Manager (block/blacklist number your hate)
14. Google.com Mobile Application:

• Google Mail
• Google Search
• Google Maps