[Touch HD General] guney:
Okay, I'll bite. :) Here's my equivalent list (without repeating what's already posted):

SoftMaker Office 2008:

Replacement for Pocket Word/Excel. Pocket Word is okay for minor uses, but if you use spreadsheets as much as I do, Pocket Excel is comically inadequate (especially after the backward steps it has taken from WM5 to WM6).

PhatNotes:

I use textual notes/lists a lot, too, and the built in software in WM does not cut it for me.

SprintDB Pro:

Relational database. I find this to be the best way to maintain my movie lists.

BackCountry Navigator:

A GPS mapping/tracking software based on map downloads on the fly. It gives me peace of mind against getting lost when I'm hiking or mountain biking in the middle of nowhere (at least in those cases where I might have a network signal).

Pocket TOPO:

The pocket version of the National Geographic TOPO! topographic map software. Does route planning and GPS tracking as well. (Unlike BackCountry Navigator, only works with limited maps exported from its own desktop PC version.)

Pocket Stars:

Good sky guide. I can't say I'm even close to using it regularly. But it's still there for the rare occasion when I might need it.

TapBirds:

Bird identification field guide. Do you see a general "outdoors" theme here? ;)

Pocket Player:

I use it mainly for audio books. It has a good resume feature and very good bookmarking capabilities.

AIDEM File Explorer:

Just a free File Explorer replacement that I find capable enough for my own needs, for those occasional cases where the original File Explorer is a bit too restrictive.

TomeRaider:

Book reader. It allows me to carry around with me a whole bookcase of books and reference sources, including an almost complete IMDB movie database and two (count 'em, two) offline full-text copies of Wikipedia. :) (One is slightly smaller and older than the other but includes images...)

Viigo:

Very decent RSS reader, though it's been diversifying into a ton of other useful features lately.

Calc98:

Much more capable free replacement for the built-in WM calculator. Good for some scientific calculation, base conversions, and unit conversions, too.

DirMap:

Utility for displaying directory subtree sizes. Also features graphic display of space usage. Very handy when trying to figure out what's taking up storage space.

FTP Client:

Very useful when I need to access some file that I don't have with me but is available on the FTP-accessible server I run at home.

Opera Mini:

Always a good idea to have additional browsers handy, for cases when one goes haywire or has specific incompatibilities with a particular website that another browser might handle just fine.

Pocket Gforce:

Poor man's vehicle dynamics analysis tool (G force measurement, acceleration/deceleration, 0-60 mph, etc.) I haven't gotten to play with it yet, but it might be a fun distraction during my next autocross event.

Resco Photo Viewer:

I had bought this for an earlier WM PDA, but it's still got more features than any photo viewing/slideshow software that comes with the Touch HD, so I still use it.

Pocket Streets:

My 2001 version still works with the Touch HD. It's still the most handy (virtually) free offline map software, if you ask me.

PocketLock:

File and directory encryption software. Quite strong encryption. I love how intuitive its integration is. (Double-clicking a file, first launches PocketLock to decrypt, than the host app to open the file. Closing the file automatically triggers PocketLock to ask you whether you want to encrypt it again.) I've been using this on every version of Windows Mobile since "Pocket PC 2002"!

Storage Tools:

I use this to fix storage card file system corruptions, and the occasional storage card defragmentation.

WMStopWatch:

At one point, this was the only free stopwatch program I could find for WM that would not stop when I turned off the device--a crucial requirement when you want to time anything longer than a few minutes.

vxIPConfig and vxUtil:

Some nice old-fashioned free networking utilities that I like keeping under my hand (trace route, port scanner, DNS lookup, ping, finger, whois, etc.).