There are many GPS free software you can use with your GPS unit. Most of the software you can download from internet and use it right way. Here is a list of free software:
1. amAze :
Web Address: http://www.amazegps.com/welcome.php
Description: This is GPS navigation for your mobile phone. It covers the US and 15 European countries. This is a java based software which enable you to Search and navigate to businesses listed in yellow pages directories.
2. Automatic Position Reporting System (APRS)
Web Address: http://www.winaprs.org/
Description: APRSâ„¢ is a multifaceted system for use with packet radio by Hams, it allows the monitoring of real time geographical information such as the position of vehicles, the status of weather, radio direction finding and much much more. It envolves mapping, GPS tracking, packet radio, etc. It is a VERY interesting facet of packet radio and has much to offer most everyone including non-hams that just want to watch over the internet.
3. Async & RINEX :
Web Download Address: http://artico.lma.fi.upm.es/numerico/miembros/antonio/async/
Description: Helps Obtaining raw data from some Garmin units.
4. Cetus GPS:
Web Address: http://www.cetusgps.dk/
Description: Cetus GPS is the Swiss Army Knife of GPS tracking and field data collection. It is intended for use by GIS surveyors, scientists, explorers and GPS enthusiasts who need to extend the features of their standard GPS equipment.
5. Cotogps :
Web Address: http://core.de/~coto/projects/cotogps/
Description: GPS program for Palm Powered Devices. It shows all important information and serves well on my Geocaching tours.
6. DGPSIP :
Web Address: http://www.wsrcc.com/wolfgang/gps/dgps-ip.html
Description: A system to send DGPS corrections over the Internet.
7. DNR Garmin Application :
Web Address: http://www.dnr.state.mn.us/mis/gis/tools/arcview/extensions/DNRGarmin/DNRGarmin.html
Description: This software was built to provide users the ability to directly transfer data between Garmin GPS handheld receivers and various GIS software packages.
8. Earthcomber :
Web Address: http://www.earthcomber.com/splash/index.html
Description: This software supports Palm, Windows Mobile Pocket PC and Smartphone and allows users to specify types of restaurants, shops, ATMs, hotels, landmarks and plot them on a map. It also has free maps for any city and county in the USA.
9. EasyGPS :
Web Address: http://www.easygps.com/default.asp
EasyGPS is the fast and easy way to transfer waypoints, routes, and tracks between your computer and your Garmin, Magellan, or Lowrance GPS.
10. flexGPS – demo version :
Web Address: http://www.flexgps.com/index.html
Description: FlexGPS enables the manipulation of maps used with a GPS Receiver.
11. G3 project :
Web Address: http://gpsed.com/show.php
Description: You can use this software with any Java-capable mobile phone connected to a GPS receiver and perform tracking, archiving and geotagging features, with the help of Google Maps and Google Earth.
12. G3 project : G7ToWin
Web Address: http://www.gpsinformation.org/ronh/
Description: G7ToWin is designed to transfer data between Garmin, Magellan, or Lowrance/Eagle GPS units and a PC.
13. G3 project : Gar2rnx
Web Address: http://artico.lma.fi.upm.es/numerico/miembros/antonio/async/
Description: It use to botain raw data from some Garmin units
14. G3 project : Garmap CE version 1.78
Web Address: http://www.catnet.ne.jp/fukuda/garmap/e_garmapce.html
Description: Garmap CE runs on H/PCs or P/PCs running Windows CE 2.0
15. G3 project : Garmap Win
Web Address: http://www.catnet.ne.jp/fukuda/garmap/e_garmapwin.html
Description: Garmap Win runs on Windows 95/98 or Windows NT 4.0. Garmap Win communicates with Garmin GPS receivers to deal with Track logs, Waypoints and Routes. It has the
16. G3 project :GEO/GARNIX
Web Address: http://homepage.ntlworld.com/anton.helm/garnix.html
Description: GEO is a scriptable coordinate conversion tool that converts lon/lat, ECEF und TM (Gauss-KrÃ¼ger) coordinate systems.
17. G3 project : GarPsi5
Web Address: http://www.geocities.com/Colosseum/Dugout/7981/psiongb.html
Description: These free GPS software programs allow you to transfer Garmin data onto your Psion models 3a/c/mx or 5.
18. G3 project : GEOsnapper
Web Address: http://www.geosnapper.com/index.php
Description: GEOsnapper geo-tags your photos to make them searchable by location.
19. G3 project : GPilotS
Web Address: http://www.cru.fr/perso/cc/GPilotS/
Description: GPilotS allows your PalmPilot to transfer waypoints, routes, and tracks to and from selected Garmin receivers.
20. G3 project : GPS3D
Web Address: http://hany.sk/~hany/RPM/gps3d.html
Description: GPS3D is a suite of free GPS software utilities to control a handheld GPS receiver from your PC and see the result in 3D. If you don’t have a GPS receiver you can use GPS3D to see MapBlast maps in 3D and also interact with a 3D representation of Earth.
21. G3 project : GpsActionReplay
Web Address: http://gpsactionreplay.free.fr/
Description: GpsActionReplay (GpsAR) is a software that enables replays and performance analysis from GPS data
22. G3 project : GPSBabel
Web Address: http://www.gpsbabel.org/
Description: GPSBabel converts waypoints, tracks, and routes from one format to another, whether that format is a common mapping format like Delorme, Streets and Trips, or even a serial or USB upload or download to a GPS receiver such as those from Garmin and Magellan.
23. G3 project : GPSCommunicator
Web Address: http://www.panazzolo.com/
Description: GPSCommunicator is a FREE utility to visually represent NMEA GPS position data in realtime. It works with NMEA 0183 GPS receivers connected via a serial port.
24. G3 project : NMEASleuth
Web Address: http://www.panazzolo.com/
Description: NMEASleuth is a FREE utility to inspect NMEA data streams from devices connected via a serial port.
25. G3 project : GPSCookie
Web Address: http://www.a2b.cc/software.a2b
Description: A2B has its own free GPS companion software, GPSCookie, available for Windows and also for PDAs running MS Pocket PC OS.