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http://browsershots.org/
BrowserShots is an open source project which allows you to see screenshots of a url in a huge number of browsers across a number of operating systems. Very useful for web site development / testing.
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http://www.thinkfree.com/
Thinkfree is similar to Zoho. It's a hosted, online office suite. It's also available in self installed versions. No email capability (that I can see).
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http://www.google.com/a/help/intl/en/index.html
Google Apps is the hosted mail / docs / etc product from Google. It comes in Free or Premier ($50/year/user).
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http://zoho.com/
Zoho is an online office suite, similar to Google Apps. It includes a hosted mail product.
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http://www.zimbra.com/
Zimbra is an open source email / collaboration software. They offer a hosted service starting from $400/year for 15 pro mailboxes.
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http://www.eapps.com/
Interesting web hosting company. VPS based hosting from $10/month including a dedicated IP and mailserver with webmail (squirrelmail / OpenWebMail).
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http://www.wolf-howl.com/blogging/wordpress-clean-backend/
A list of security related plugins for WordPress. Some good stuff.
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http://www.dollarsblog.com/
DollarsBlog is a blog aimed at professional bloggers. Potential affiliate for wppro business.
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http://wordpress.org/extend/plugins/askapache-password-protect/
AskApache Password Protect is a WordPress plugin which uses .htaccess and other methods to block some common WordPress attacks. Some of the options get in the way of functionality, but many do not and will help.
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http://www.buzzbums.com/
BuzzBums is a blog directory. It costs $1 to join for a minimum of 25 years. They aggregate content and offer aggregated feeds for member blogs.
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http://www.controlledmail.com/
Controlled Mail is an outbound mail service (SMTP provider) with a very strong focus on genuine mail delivery. They accept no bulk mailings whatsoever and support SPF and DKIM by default. They also prevent cross client forgery.
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http://wordpress.org/extend/plugins/wp-hashcash/
WP-HashCash implements the hashcash approach to spam prevention as a WordPress plugin.
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http://wordpress.org/extend/plugins/wp-spamfree/
WP-SpamFree uses a combination of javascript, cookies and algorithmic approach to apparently cut out spam. Requires zero config, totally cache compatible. It tells the user if the comment has been blocked, which is very handy.
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http://aql.com/site/email2sms.php
aql offer an email to SMS service and offer a link to nagios server monitoring.
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http://www.amember.com/
aMember is a membership management script in PHP. It integrates with multiple payment gateways, handles secure access, integrates with WordPress, Joomla, vBulletin, etc. Looks useful. $180.
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http://www.la-samhna.de/samhain/
Samhain is a multiplatform, open source host-based intrusion detection system (HIDS). Samhain provides file integrity checking, as well as rootkit detection, port monitoring, detection of rogue SUID executables, and hidden processes.
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http://www.cs.tut.fi/%7Erammer/aide/manual.html
The beginnings of the manual for AIDE (Advanced Intrusion Detection Environment), the free replacement for Tripwire.
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http://www.ipipi.com/
ipipi.com is an SMS gateway service. You can send messages online, via email, etc.
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http://www.textmagic.com/
TextMagic is a global sms delivery service. You can delivery texts via email, gateways, their own windows app, etc.
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http://www.noupe.com/how-tos/wordpress-security-tips-and-hacks.html
An article from Noupe.com on securing WordPress installations. Some general tips such as restrict by IPs, block repeated failed logins, disallow directory listings, block access to wp-config.php, etc.
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http://wordpress.org/extend/plugins/wp-security-scan/
WP Security Scan is a WordPress plugin which scans your WordPress installation for security vulnerabilities and suggests corrective actions.
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http://www.techcrunch.com/2008/06/11/my-blog-was-hacked-is-yours-next-huge-wordpress-security-issues/
Article on WordPress security by TechCrunch. Good post encouraging people to keep their version up to date, etc.
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http://sourceforge.net/projects/tripwire/
Tripwire monitors files on the filesystem for changes as a method of intrusion detection. Similar systems include AIDE and Samhain. Useful for detecting web site hacks.
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http://ocaoimh.ie/2008/06/08/did-your-wordpress-site-get-hacked/
Donncha writes a useful article on detecting if your site has been hacked, monitoring systems to check for hacks, and how to secure your site to avoid future hacks.
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http://automattic.com/services/support-network/
Automattic offers support services for WordPress and WordPress MU (Multi-User) through the Automattic Support Network. $2'500 basic, or $5'000 premium per person per year. Premium includes performance tuning, enhancements, etc.