EUGENE'HOM is a gene prediction software for eukaryotic organisms based on comparative analysis. The data is currently tuned for plant sequences of up to 400kb.
PatMatch is a pattern matching tool that allows you to search for short (<20 residues) nucleotide or peptide sequences and can accomodate ambiguous/degenerate patterns.
The PREP (Predictive RNA Editors for Plants) suite predicts sites of RNA editing based on the principle that editing in plant organelles increases the conservation of proteins across species. Predictors for mitochondrial genes, chloroplast genes, and alignments input by the user are included.