CSipSimple - CSipSimple is a SIP application for android devices.
Takoboto - Japanese dictionary & Japanese language learning tool.
Sipdroid - Free and open-source SIP/VoIP Client
Sumatora - Offline Japanese dictionary for Android
Handy News Reader - Handy News Reader is a free no-ads RSS reader for reading offline contents from RSS feeds or web sites without RSS feeds.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems