I simply want to find a program that searches through seeds to find a specific biome in the immediate spawn area. I really enjoy building upon natural terrain and for a specific project I have in mind I need a Flower Forest at spawn. I've probably spent 13 hours or so in the past week generating worlds with nothing that spectacular. It seems like something like this would exist. Thanks.
I suggest that you download Amidst v4.6, run it, select a VANILLA profile for the PCMC version you prefer,
and start hitting Ctrl-R. (the link is in my signature)
That will cause Amidst to display the biome maps of random seeds.
Ctrl-H in Amidst gives you the seed input dialog.
Amidst 4.6 works with MC Java releases 1.0 up to and including 1.16.5.
Hint: Place Amidst in it's own folder and create an empty file in that folder named "history.txt".
When Amidst starts up it will detect that file and from then on will log of every seed that it displays to the end of that file.
That way, if you hit Ctrl-R too quickly you can find out what the seed was of the previous map and redisplay it.
I use Notepad++ as my default text editor as it will update itself if Amidst adds a line to history.txt while it is open in a Notepad++ tab.
Performance note: If you are looking for a specific biome at spawn for a 1.13.2 and above world, I suggest that you run Amidst with a VANILLA 1.12.2 profile to search (the world maps will be displayed about 3 times faster than with later releases). Once you find a world that seems to fit your needs hit Ctrl-C to copy the seed to your clipboard and switch profiles to a VANILLA copy of your desired release and use Ctrl-N Ctrl-V to enter that seed back into Amidst and display the desired map.
BTW: It is possible to have multiple instances of Amidst running at the same time. I currently have one for 1.12.2 and another for 1.13.2, 1.14.4, or 1.15.2 running.
That way I can search random seeds quickly with 1.12.2 and if I see an interesting one copy and paste the seed into the much slower 1.13.2 / 1.14.4/ 1.15.2 instance.
You can click on the icon in the lower right corner of an Amidst window and then select which biomes you wish to highlight, then click the inactive to change to active. Then start hitting Ctrl-R until Amidst shows spawn in the desired biome.
The seed "5722261026359646418" spawns you less than 200 blocks from a Flower Forest.