You do not need Free Ware. The solution is in Photoshop.
It's called ACTIONS. Open views/history. There is an Actions on that header. Click on it and it will open up many actions that you can use and record for batch processing hundreds of files that you want to convert while you go have a beer or watch your favorite TV show.
The actions are not hard to record.
All you have to do is record one new action. Name the file such as: Convert JPEG to TIFF and save the action.
When you want to convert a large file of JPEG files to TIFFS you can convert the folder using the ACTIONS that you set up, using BATCH COMMANDS.
We used to use this sort of RECORD ACTIONS years ago with a software program that sold for $298. Right now, it is in Adobe Photoshop 5, 6 & 7.
Go to about.com and get the link to Adobe Photoshop Actions. Follow the link and you will be amazed on in-sider tutorials and tricks!
I am pasting an article from that site for you that explains how to set up ACTIONS & BATCH.
Here it is:
To record an action, you'll need to use the actions palette. If the actions palette is not visible on your screen, open it by going to Window -> Show Actions.
Notice the arrow at the top right of the actions palette. This arrow brings up the actions menu shown on the right.
Actions MenuClick the arrow to bring up the menu and choose New Set. An action set can contain several actions. If you've never created actions before, it's a good idea to save all your personal actions in a set. Give your new Action Set a name, then click OK.
Next, choose New Action from the menu. Give your action a descriptive name. After you click OK, you'll see the red dot on the actions palette to show you're recording.
Recording an Action
For this example I'm going to record an action to rotate an image. Go to edit and choose the rotate command, then go to the actions palette and hit the stop button (the black square).
Now you have an action!
To use the action in batch mode, you would go to File -> Automate -> Batch. You'll see the dialog box below:
Photoshop's Batch Command options
In the dialog box, simply select the set and the action you just created. For the source, choose the folder that contains the images you want to process. For the destination, choose another folder for Photoshop to output the rotated images. (You can choose "Save and Close" to have Photoshop save them in the source folder, but I don't advise it... it's too easy to make a mistake. It's much safer to use two folders and then delete the original files after you've made sure your batch processing was successful.) For errors you can either have the batch proccess stop, or create a log file of the errors. When you hit OK, you can just sit back and watch while Photoshop does all the work for you!
Once you have an action and you know how to use the batch command, you can use it anytime you have several photos you need to rotate. You could even do an another action to resize a folder of images.
Hope that helped you.