what freeware program could i use to replace adobe’s lightroom?

You can try
blueMarine (FREE) : http://bluemarine.tidalwave.it/
blueMarine foundation is very similar to existing applications such as Adobe Lightroom or Apple Aperture: a photo browser, which can be explored in different ways (by folder, by calendar, by tags, by galleries). This is just a core upon which different modules can be plugged in. The aim of blueMarine is to fully support the photographic workflow, even before the photo shoot (for instance, trip planning supported by maps) and beyond print or archival. An open source application for the digital photo workflow.
OS Supported: Windows, Linux, Mac OS X 10.4

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blueMarine does work, and may be useful, requires Java and patience
http://bluemarine.tidalwave.it/

Studioline Photo Classic
http://www.studioline.biz/EN/products/overview-photo-basic/default.htm
Pictomio –
http://www.pictomio.com/Features.aspx

Picasa Album viewer
http://picasa.google.com/
JetPhoto –
http://www.jetphotosoft.com/web/?s=downloads

IrfanView
http://www.irfanview.com/
XnView
http://www.xnview.com/en/index.html
FastStone Image Viewer –
http://www.faststone.org/FSViewerDetail.htm

Photoscape
http://www.photoscape.org/ps/main/screenshot.php
OLYMPUS Master™ 2
http://www.olympusamerica.com/cpg_section/oima_softwaremaster.asp

check software you may have for computer OS , cameras and printer,