1. Nyx shell account
 URL : http://www.nyx.net
 PRICE : free
 TYPE : NO BOTS, MUDS and such programs unix shell.
 QUOTA : 1 MB (if over, all files are deleted)
 SERVER : SunOS 4.1.4

At first, validation is required, so you need to send a message by mail directly to nyx. In this "non-validated" mode you have only a few options, including compilation / running programs, editing / deleting files and similiar. Once you get validated, you get a real unix shell.

2. Cyberspace (grex) shell account
URL : http://cyberspace.org/nu/newuser.html
PRICE : free
TYPE : NO BOTS, net related programs wont work.
INCLUDES: shell program by choice (bash,csh,ksh...), email (+forwarding),
web space (html files only) SERVER : SunOS 4.1.4

3. Suburbia shell account
URL : http://suburbia.com.au/
PRICE : free
TYPE : NO BOTS, BG Processes
INCLUDES: e-mail, web space, ftp, shell account, irc, usenet
OPENING : email helpdesk@suburbia.com.au with a GOOD reason for a shellaccount
SERVER : Unknown Linux

4. Arbornet shell account
URL : http://www.arbornet.org/projects.html
PRICE : free
TYPE : No bg processes
INCLUDES: e-mail, compilers, web space, lynx, "menu" shell by def. logout to get a real one.
SERVER : BSDI BSD/OS 3.1

5. Ductape shell account ** temporarily halted **
URL : http://www.ductape.net/members/form.html
PRICE : free
TYPE : NO BOTS, 24h BG processes...
INCLUDES: shell, web space, e-mail (+forwarding), irc client, screen, ssh...
OPENING : fill online form and submit a request...
NOTE: some domains are banned, like (*.tel.hr).
QUOTA : 2 MB
SERVER : Red Hat Linux