For reference, these are the packages on a stock N900 PR1.3 install that link to OpenSSL:
Closed packages:
as-daemon (active sync daemon for Microsoft email servers)
osso-wlan-security (provides security stuff for WiFi)
nokiamessaging (nokia messaging stuff, no longer works AFAIK)
adobe-flashplayer (Flash plugin)
sharing-services-default (sharing services stuff, its the OVI plugin that uses OpenSSL)
funambol-cpp-api (SyncML stuff)
location-proxy (proxy to handle the communications between the GPS hardware and the AGPS SUPL server)
osso-backup (backup program)
ota-settings (handles cellular data connection settings sent over the air)
maesync-backend (backend for syncing with Nokia PC application and things)
liblomesa (low level image viewer API)

Open packages:
maemo-security-certman (maemo certificate manager)
maemo-security-certman-applet (maemo certificate manager applet)
tinymail (tinymail backend stuff for modest)
xorg-server (main binaries for X11)
curl (command line tool for accessing URLs)
loudmouth (library for Jabber)
microb-eal (microb component)
qt4-x11 (QT4 package)
sofia-sip (SIP library)
clinkc (UPnP library)

Packages who's openness is unknown:
tablet-browser-ui (tablet browser main binary, I think I saw source code for this one somewhere but I cant find it and I may have been mistaken)
connui-internet (internet connectivity UI widgets, dont know if the clone done for maemo-leste is complete and can be compiled to work as a drop-in replacement for the Fremantle package)
connui-wlan (wlan connectivity UI widgets, dont know if the clone done for maemo-leste is complete and can be compiled to work as a drop-in replacement for the Fremantle package)