As well as GRASS complements Quantum GIS, SEXTANTE does the same with gvSIG, keeping the specialty. These are the best efforts of collaboration between open source alternatives in the geospatial environment, searching to prevent unnecessary duplication.
The gvSIG effort of maintaining vector handling with many CAD capabilities is complemented with everything that has been built in SEXTANTE after its abandon its approach merely raster with SAGA and become a library so many other GIS programs implemented and extend it to the vector approach. Here I show you the list of about 240 algorithms that exist for gvSIG 1.9:
 Patterns Analysis
Diversity
Dominance
Fragmentation
Number of classes
Different

 Basic hydrological analysis
Flow collection
Watersheds
Watersheds by size
Slopebasin into a zone
Slopebasin to a given point
Eliminate depressions
Drainage System
Time out

 Costs, distances and routes
Accumulated Cost (anisotropic)
– Accumulated Cost (anisotropic)(B)
– Accumulated Cost (combined)
– Accumulated Cost (isotropic)
Cost per predefined path
Cost per predefined path (anisotropic)
Cost per predefined path (anisotropic) (B)
– Generating alternative routes
– Polar to Rectangular
– Minimumcost route
– Sum of costs to all points

 Statistics for multilayered raster cell
– Asymmetry
– Maximum Layer value
– Minimum Layer value
Count equal to
Count greater than
Kurtosis
Max
Majority
Average
Medium
Minimum
Minority
Range
Variance
 Geostatistics
– VarianceRadio
– Semivariance (raster)

 Geomorfometry relief analysis
– Real Area
– Classification of landforms
– Anisotropic coefficient of variation
– Curvatures
– Hypsometry
– LiftIndex – relief
– Protection Index
– Orientation
– Slope
 Tool Analysis for raster layers
– Change Vector Analysis
– Unsupervised classification (clustering)
– Supervised classification
– Supervised classification (B)
– ROC Curve
– Analytical Hierarchy (AHP)
– Predictive models
Ordered Weighted Averaging (OWA)

 Basic tools for raster layers
Add
– Fit to extension with valid data
– Calculation of volumes
– Change data type
Complete grid
– Correlation between layers
– Cut raster layer with polygon
– Basic statistics
– Filter 3 x 3 user defined
– Histogram
– Invert mask
– Gradient lines
– Locate peaks
– Normalize
Order
– Flip / invest
– Fill cells with no data
– Fill cells with no data (neighborhood)
– Merge Layers
– Volumes between two layers
 Calculation Tools for raster layers
– MapsCalculator

 Tools for layer lines
– Convert lines of equally spaced dots
– Convert lines in single segments
– Convert polylines to polygons
– Fragment layer lines with points
– Line Invest sense
– Directional Media
– Sampling ends of lines
– Property geometric lines
– Separate strings in nodes
Simplify lines

 Tools for polygons layers
– Adjust N points in polygon
Centroids
– Counting points on polygons
– Convert polygons into polylines
– Symmetric difference
– Eliminate gaps
– Grid statistics in polygons
Intersection
– Geometric properties of polygons
Union

 Tools for point layers
– PointSet layer to another layer
– Nearest neighbor analysis
– Analysis by quadrant
– Add coordinates to points
– Spatial autocorrelation
– Layer of points from Table
– Medium Center
– Medium Center and typical distance
Spatial (cluster) classification
– Minimum Envelopes
– Ripley’s K
Clearing dot’s layer
– Distance Matrix
– Sampling raster layers
– Disturbing layer points
– Delaunay triangulation

 Tools for categorical raster layers
– Cross check (Kappa Index)
– Merge grids
– Delete Aggregates by size
– Statistics class
Fragstats (metric area / density / edge)
Fragstats (metrics of diversity)
– from table and classified grid
– Aggregation Index
– Lagoon
 Tools for tables
– Correlation between fields
– Basic statistics
 Optimal location of elements
– Optimal location
 Fuzzy logic
– Prepare for fuzzy logic

 Tools for generic vector layers
Bounding Box
– Field Calculator
– Vector layer with random geometries
Sort (cluster)
– Turning geometries to points
– Correlation between fields
Cut
– Cut by rectangle
– Create grid
– Difference
– Dissolve
– Basic statistics
– Exporting vector layer
– Histogram
– Gather
– Separate entities
– Separate multiparty entities
– Test of normality
– Transform

 Tools for creating new RASTER layers
– Generate Bernoulli random grid
Generate normal random grid
Generate uniform random grid
Generate artificial MDT
– Grid based on mathematical function
– Constant value Grid
 Lighting and visibility
– Visual Exposition
Horizontal visible
– Line of Sight
– Line of Sight (RF)
– Solar radiation
– Shaded Relief
Visibility

 Vegetation indexes
CTVI
NDVI
NRVI
PVI(Perry and Lautenschlager)
PVI(Qi et al)
PVI(Walther and Shabaani)
TTVI
TVI
 Profiles
Longitudinal profile
– Profile as line flow
– Cross Sections

 Indexes and other hydrological parameters
– Net balance of cells
– Edge Contamination
– Creating synthetic histogram
– Distance to drainage
– Lift on the drainage
– C factor from NDVI
– Instantaneous unit histogram geomorphologic
– Topographic indexes
– Slope length
– Strahler order
– USPED A hydrologic model
– Maximum value upstream
– Mean upstream

 Statistical methods
– Principal component analysis
– Binomial probability distribution
– Chisquare probability distribution
– Exponential distribution function
– Normal probability distribution
– Student probability distribution
– Covariance matrix
– Regression
– Multiple Regression

 Rasterization and Interpolation
– Linear Decrease
– Density
– Density (kernel)
– Inverse distance
Kriging
– Universal Kriging
– Rasterizing vector layer

 Reclassification of RASTER layers
– Split into n classes of equal amplitude
– Split into n classes of equal area
– Reclassify
– Reclassify consecutive classes
– Reclassify disjoint classes

 Treatment and image analysis
– Thinning
– Calibrate an image
– Calibrate an image (by regression)
– Detect and vectorize individual trees
Equalization
Erosion/Expansion
Contrast expansion
HIS –> RGB
RGB –> HIS

 Vectorization
Raster layer to dots layer
Contour level
– Vectorizing raster layer (lines)
– Vectorizing raster layer (polygons)

 Areas of influence (buffers)
– Zone of influence (raster)
– Zone of influence of fixed distance
– Zone of influence of variable distance
– Zone of influence through threshold

From here you can download SEXTANT, the compatible version with gvSIG 1.9 (stable) Installing it only requires that the moment it asks you, indicate where gvSIG is installed.