Mukti is a project mainly written in JAVA and C, it's free.
mesh network with opportunistic routing for android
Recent political events in middle-eastern and north-african countries have demonstrated that traditional communication media are useless when infrastructure is controlled by a rogue/oppressive regime. Similar situation can also arise due to large natural disasters (e.g., earthquakes, tsunami) that can wipe out complete communication infrastructure. While sending information outside a region is dependent on the availability of a handful of egress points, communication inside the region can be enabled using wireless mesh networks (WMN). By incorporating ideas from delay-tolerant networking (DTN) literature, eventual reachability can also be ensured. Our goal is to build an application for smart phones to enable dissemination of information in hostile/disrupted environments by incorporating WMN and DTN features. While our initial medium of data transfer will be WiFi, ideally our application should be able to opportunistically use 3G and Bluetooth as well.
This project's intitial code base is android-wifi-tether source: svn checkout http://android-wifi-tether.googlecode.com/svn/trunk/
This software turns your android-based handset (tested with a T-Mobile G1) into something like a wireless access point (that's incorrect in technical-view because the wireless interface will be set up in AdHoc-Mode). Clients can connect via wifi or bluetooth and get access to internet using the 3G-connection (GPRS/EDGE/UMTS/HSDPA) which is established by the handset.
This application needs root-permission.
parrothd (shell-scripts for tethering - an excellent starting-point) http://forum.xda-developers.com/showthread.php?t=474470
zodiac (updated tether shell script that works without JF-specific utilities) http://code.google.com/p/android-wifi-tether/issues/detail?id=9
manowarlord - (iconset) http://www.kde-look.org/content/show.php/KDE4+Crystal+Diamond+Icons?content=92163
Eugene Ray (iptables)
Robert "Unlogic" Olofsson (lock icons) http://www.unlogic.se/projects/openicons