A new resource called ‘Cydia Search’ lets you browse the Cydia’s huge collection of jailbreak tweaks and applications from the convenience of your desktop. Finding the packages you are looking for sometimes be a slow and unpleasant process, but thanks to @S0n1c_Dev, you can now find them from your web browser.
Cydia Search tool released, it allows you to download any free (non-paid) package from the main repos as a deb file. You can also view all descreption and some screenshots from archived tweaks. But the developer also notes users that due to piracy, paid packages are not downloadable.
If you are interested in it, you could visit this page for your convenience: http://s0n1c.org/cydia/
On the other hand, some jailbreakers think tweakupdates could be an alternative which maintains a database of all packages in the main Cydia repositories for jailbroken iOS devices. You may refer here: http://tweakupdates.com/
3uTools also compiles some tweaks for you as below: